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rfc:fyi:fyi30

Network Working Group G. Kessler Request for Comments: 2151 S. Shepard FYI: 30 Hill Associates, Inc. Obsoletes: RFC 1739 June 1997 Category: Informational

        A Primer On Internet and TCP/IP Tools and Utilities

Status of this Memo

 This memo provides information for the Internet community.  This memo
 does not specify an Internet standard of any kind.  Distribution of
 this memo is unlimited.

Abstract

 This memo is an introductory guide to many of the most commonly-
 available TCP/IP and Internet tools and utilities. It also describes
 discussion lists accessible from the Internet, ways to obtain
 Internet and TCP/IP documents, and some resources that help users
 weave their way through the Internet.

Table of Contents

 1. Introduction...................................................  2
 2. Nomenclature...................................................  2
 3. Finding Information About Internet Hosts and Domains...........  3
    3.1. NSLOOKUP..................................................  3
    3.2. Ping......................................................  6
    3.3. Finger....................................................  8
    3.4. Traceroute................................................  9
 4. The Two Fundamental Tools...................................... 12
    4.1. TELNET.................................................... 12
    4.2. FTP....................................................... 15
 5. User Database Lookup Tools..................................... 19
    5.1. WHOIS/NICNAME............................................. 19
    5.2. KNOWBOT................................................... 23
 6. Information Servers............................................ 24
    6.1. Archie.................................................... 24
    6.2. Gopher.................................................... 28
    6.3. VERONICA, JUGHEAD, and WAIS............................... 30
 7. The World Wide Web............................................. 31
    7.1. Uniform Resource Locators................................. 34
    7.2. User Directories on the Web............................... 35
    7.3. Other Service Accessible Via the Web...................... 36
 8. Discussion Lists and Newsgroups................................ 37
    8.1. Internet Discussion Lists................................. 37

Kessler & Shepard Informational [Page 1] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

    8.2. LISTSERV.................................................. 38
    8.3. Majordomo................................................. 38
    8.4. Usenet.................................................... 39
    8.5 Finding Discussion Lists and Newsgroups.................... 40
 9. Internet Documentation......................................... 41
    9.1. Request for Comments (RFCs)............................... 41
    9.2. Internet Standards........................................ 44
    9.3. For Your Information Documents............................ 45
    9.4. Best Current Practices.................................... 45
    9.5. RARE Technical Reports.................................... 46
 10. Perusing the Internet......................................... 46
 11. Acronyms and Abbreviations.................................... 48
 12. Security Considerations....................................... 49
 13. Acknowledgments............................................... 49
 14. References.................................................... 49
 15. Authors' Address.............................................. 51

1. Introduction

 This memo is an introductory guide to some of the most commonly-
 available TCP/IP and Internet tools and utilities that allow users to
 access the wide variety of information on the network, from
 determining if a particular host is up to viewing a multimedia thesis
 on foreign policy. It also describes discussion lists accessible from
 the Internet, ways to obtain Internet and TCP/IP documents, and some
 resources that help users weave their way through the Internet. This
 memo may be used as a tutorial for individual self-learning, a step-
 by-step laboratory manual for a course, or as the basis for a site's
 users manual. It is intended as a basic guide only and will refer to
 other sources for more detailed information.

2. Nomenclature

 The following sections provide descriptions and detailed examples of
 several TCP/IP utilities and applications, including the reproduction
 of actual sessions using these utilities (with some extraneous
 information removed). Each section describes a single TCP/IP-based
 tool, it's application, and, in some cases, how it works. The text
 description is usually followed by an actual sample session.
 The sample dialogues shown below were obtained from a variety of
 software and hardware systems, including AIX running on an IBM
 RS/6000, Linux on an Intel 486, Multinet TCP/IP over VMS on a VAX,
 and FTP Software's OnNet (formerly PC/TCP) running on a DOS/Windows
 PC. While the examples below can be used as a guide to using and
 learning about the capabilities of TCP/IP tools, the reader should
 understand that not all of these utilities may be found at all TCP/IP
 hosts nor in all commercial software packages. Furthermore, the user

Kessler & Shepard Informational [Page 2] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 interface for different packages will be different and the actual
 command line may appear differently than shown here; this will be
 particularly true for graphical user interfaces running over Windows,
 X-Windows, OS/2, or Macintosh systems. Windows-based sessions are not
 shown in this RFC because of the desire to have a text version of
 this document; in addition, most GUI-based TCP/IP packages obscure
 some of the detail that is essential for understanding what is really
 happening when you click on a button or drag a file. The Internet has
 many exciting things to offer but standardized interfaces to the
 protocols is not yet one of them!  This guide will not provide any
 detail or motivation about the Internet Protocol Suite; more
 information about the TCP/IP protocols and related issues may be
 found in RFC 1180 [29], Comer [6], Feit [7], Kessler [14], and
 Stevens [30].
 In the descriptions below, commands are shown in a Courier font
 (Postscript and HTML versions); items appearing in square brackets
 ([]) are optional, the vertical-bar (|) means "or," parameters
 appearing with no brackets or within curly brackets ({}) are
 mandatory, and parameter names that need to be replaced with a
 specific value will be shown in italics (Postscript and HTML
 versions) or within angle brackets (<>, text version). In the sample
 dialogues, user input is in bold (Postscript and HTML versions) or
 denoted with asterisks (**) in the margin (text version).

3. Finding Information About Internet Hosts and Domains

 There are several tools that let you learn information about Internet
 hosts and domains. These tools provide the ability for an application
 or a user to perform host name/address reconciliation (NSLOOKUP),
 determine whether another host is up and available (PING), learn
 about another host's users (Finger), and learn the route that packets
 will take to another host (Traceroute).

3.1. NSLOOKUP

 NSLOOKUP is the name server lookup program that comes with many
 TCP/IP software packages. A user can use NSLOOKUP to examine entries
 in the Domain Name System (DNS) database that pertain to a particular
 host or domain; one common use is to determine a host system's IP
 address from its name or the host's name from its IP address. The
 general form of the command to make a single query is:
    nslookup [IP_address|host_name]
 If the program is started without any parameters, the user will be
 prompted for input; the user can enter either an IP address or host
 name at that time, and the program will respond with the name and

Kessler & Shepard Informational [Page 3] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 address of the default name sever, the name server actually used to
 resolve each request, and the IP address and host name that was
 queried. Exit is used to quit the NSLOOKUP application.
 Three simple queries are shown in the example below:
    1 Requests the address of the host named www.hill.com, the World
    Wide Web server at Hill Associates. As it turns out, this is not
    the true name of the host, but an alias. The full name of the host
    and the IP address are listed by NSLOOKUP.
    2 Requests the address of host syrup.hill.com, which is the same
    host as in the first query. Note that NSLOOKUP provides a "non-
    authoritative" answer. Since NSLOOKUP just queried this same
    address, the information is still in its cache memory. Rather than
    send additional messages to the name server, the answer is one
    that it remembers from before; the server didn't look up the
    information again, however, so it is not guaranteed to still be
    accurate (because the information might have changed within the
    last few milliseconds!).
    3 Requests the name of the host with the given IP address. The
    result points to the Internet gateway to Australia, munnari.oz.au.
 One additional query is shown in the dialogue below. NSLOOKUP
 examines information that is stored by the DNS. The default NSLOOKUP
 queries examine basic address records (called "A records") to
 reconcile the host name and IP address, although other information is
 also available. In the final query below, for example, the user wants
 to know where electronic mail addressed to the hill.com domain
 actually gets delivered, since hill.com is not the true name of an
 actual host. This is accomplished by changing the query type to look
 for mail exchange (MX) records by issuing a set type command (which
 must be in lower case). The query shows that mail addressed to
 hill.com is actually sent to a mail server called mail.hill.com. If
 that system is not available, mail delivery will be attempted to
 first mailme.hill.com and then to netcomsv.netcom.com; the order of
 these attempts is controlled by the "preference" value. This query
 also returns the name of the domain's name servers and all associated
 IP addresses.
 The DNS is beyond the scope of this introduction, although more
 information about the concepts and structure of the DNS can be found
 in STD 13/RFC 1034 [19], RFC 1591 [21], and Kessler [16]. The help
 command can be issued at the program prompt for information about
 NSLOOKUP's more advanced commands.

Kessler & Shepard Informational [Page 4] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 TECHNICAL NOTE: There are other tools that might be available on your
 system or with your software for examining the DNS. Alternatives to
 NSLOOKUP include HOST and DIG.
====================================================================

SMCVAX$ nslookup Default Server: ns1.ner.bbnplanet.net Address: 192.52.71.5 > www.hill.com

Name:    syrup.hill.com
Address:  199.182.20.3
Aliases:  www.hill.com

> syrup.hill.com Non-authoritative answer: Name: syrup.hill.com Address: 199.182.20.3 > 128.250.1.21

Name:    munnari.OZ.AU
Address:  128.250.1.21

> set type=MX > hill.com

hill.com  preference = 20, mail exchanger = mail.hill.com
hill.com  preference = 40, mail exchanger = mailme.hill.com
hill.com  preference = 60, mail exchanger = netcomsv.netcom.com
hill.com  nameserver = nameme.hill.com
hill.com  nameserver = ns1.noc.netcom.net
hill.com  nameserver = ns.netcom.com
mail.hill.com  internet address = 199.182.20.4
mailme.hill.com     internet address = 199.182.20.3
netcomsv.netcom.com internet address = 192.100.81.101
ns1.noc.netcom.net  internet address = 204.31.1.1
ns.netcom.com  internet address = 192.100.81.105

> exit SMCVAX$ ==================================================================== Kessler & Shepard Informational [Page 5] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 3.2. Ping Ping, reportedly an acronym for the Packet Internetwork Groper, is one of the most widely available tools bundled with TCP/IP software packages. Ping uses a series of Internet Control Message Protocol (ICMP) [22] Echo messages to determine if a remote host is active or inactive, and to determine the round-trip delay in communicating with it. A common form of the Ping command, showing some of the more commonly available options that are of use to general users, is: ping [-q] [-v] [-R] [-c Count] [-i Wait] [-s PacketSize] Host where: -q Quiet output; nothing is displayed except summary lines at startup and completion -v Verbose output, which lists ICMP packets that are received in addition to Echo Responses -R Record route option; includes the RECORD_ROUTE option in the Echo Request packet and displays the route buffer on returned packets -c Count Specifies the number of Echo Requests to be sent before concluding test (default is to run until interrupted with a control-C) -i Wait Indicates the number of seconds to wait between sending each packet (default = 1) -s PacketSize Specifies the number of data bytes to be sent; the total ICMP packet size will be PacketSize+8 bytes due to the ICMP header (default = 56, or a 64 byte packet) Host IP address or host name of target system In the first example below, the user pings the host thumper.bellcore.com, requesting that 6 (-c) messages be sent, each containing 64 bytes (-s) of user data. The display shows the round- trip delay of each Echo message returned to the sending host; at the end of the test, summary statistics are displayed. Kessler & Shepard Informational [Page 6] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 In the second example, the user pings the host smcvax.smcvt.edu, requesting that 10 messages be sent in quite mode (-q). In this case, a summary is printed at the conclusion of the test and individual responses are not listed. TECHNICAL NOTE: Older versions of the Ping command, which are still available on some systems, had the following general format: ping [-s] {IP_address|host_name} [PacketSize] [Count] In this form, the optional "-s" string tells the system to continually send an ICMP Echo message every second; the optional PacketSize parameter specifies the number of bytes in the Echo message (the message will contain PacketSize-8 bytes of data; the default is 56 bytes of data and a 64 byte message); and the optional Count parameter indicates the number of Echo messages to send before concluding the test (the default is to run the test continuously until interrupted). ==================================================================== syrup:/home$ ping -c 6 -s 64 thumper.bellcore.com

PING thumper.bellcore.com (128.96.41.1): 64 data bytes
72 bytes from 128.96.41.1: icmp_seq=0 ttl=240 time=641.8 ms
72 bytes from 128.96.41.1: icmp_seq=2 ttl=240 time=1072.7 ms
72 bytes from 128.96.41.1: icmp_seq=3 ttl=240 time=1447.4 ms
72 bytes from 128.96.41.1: icmp_seq=4 ttl=240 time=758.5 ms
72 bytes from 128.96.41.1: icmp_seq=5 ttl=240 time=482.1 ms
  1. – thumper.bellcore.com ping statistics —

6 packets transmitted, 5 packets received, 16% packet loss

round-trip min/avg/max = 482.1/880.5/1447.4 ms

syrup:/home$ ping -q -c 10 smcvax.smcvt.edu PING smcvax.smcvt.edu (192.80.64.1): 56 data bytes — smcvax.smcvt.edu ping statistics — 10 packets transmitted, 8 packets received, 20% packet loss round-trip min/avg/max = 217.8/246.4/301.5 ms ==================================================================== Kessler & Shepard Informational [Page 7] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 3.3. Finger The Finger program may be used to find out who is logged in on another system or to find out detailed information about a specific user. This command has also introduced a brand new verb; fingering someone on the Internet is not necessarily a rude thing to do! The Finger User Information Protocol is described in RFC 1288 [32]. The most general format of the Finger command is: finger [username]@host_name The first example below shows the result of fingering an individual user at a remote system. The first line of the response shows the username, the user's real name, their process identifier, application, and terminal port number. Additional information may be supplied at the option of the user in "plan" and/or "project" files that they supply; these files are often named PLAN.TXT or PROJECT.TXT, respectively, and reside in a user's root directory (or somewhere in an appropriate search path). The second example shows the result of fingering a remote system. This lists all of the processes currently running at the fingered system or other information, depending upon how the remote system's administrator set up the system to respond to the Finger command. ==================================================================== C:> finger kumquat@smcvax.smcvt.edu

[smcvax.smcvt.edu]
KUMQUAT  Gary Kessler            KUMQUAT not logged in
Last login Fri 16-Sep-1996 3:47PM-EDT
Plan:
===================================================================
Gary C. Kessler
Adjunct Faculty Member, Graduate College
INTERNET:  kumquat@smcvt.edu
===================================================================

C:> finger @smcvax.smcvt.edu [smcvax.smcvt.edu] Tuesday, September 17, 1996 10:12AM-EDT Up 30 09:40:18 5+1 Jobs on SMCVAX Load ave 0.16 0.19 0.21 Kessler & Shepard Informational [Page 8] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 User Personal Name Subsys Terminal Console Location GOODWIN Dave Goodwin LYNX 6.NTY2 waldo.smcvt.edu JAT John Tronoan TELNET 1.TXA5 HELPDESK System Manager EDT 2:08.NTY4 [199.93.35.182] SMITH Lorraine Smith PINE .NTY3 [199.93.34.139] SYSTEM System Manager MAIL 23.OPA0 The VAX Console *DCL* SMCVX1$OPA0 The VAX Console ==================================================================== 3.4. Traceroute Traceroute is another common TCP/IP tool, this one allowing users to learn about the route that packets take from their local host to a remote host. Although used often by network and system managers as a simple, yet powerful, debugging tool, traceroute can be used by end users to learn something about the ever-changing structure of the Internet. The classic Traceroute command has the following general format (where "#" represents a positive integer value associated with the qualifier): traceroute [-m #] [-q #] [-w #] [-p #] {IP_address|host_name} where -m is the maximum allowable TTL value, measured as the number of hops allowed before the program terminates (default = 30) -q is the number of UDP packets that will be sent with each time-to-live setting (default = 3) -w is the amount of time, in seconds, to wait for an answer from a particular router before giving up (default= 5) -p is the invalid port address at the remote host (default = 33434) The Traceroute example below shows the route between a host at St. Michael's College (domain smcvt.edu) and a host at Hill Associates (www.hill.com), both located in Colchester, VT but served by different Internet service providers (ISP). Kessler & Shepard Informational [Page 9] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 1 St. Michael's College is connected to the Internet via BBN Planet; since the mid-1980s, BBN operated the NSF's regional ISP, called the New England Academic and Research Network (NEARNET), which was renamed in 1994. The first hop, then, goes to St. Mike's BBN Planet gateway router (smc.bbnplanet.net). The next hop goes to another BBN Planet router (denoted here only by IP address since a name was not assigned to the device), until the packet reaches the BBN Planet T3 backbone. 2 The packet takes two hops through routers at BBN Planet's Cambridge (MA) facility and is then forwarded to BBN Planet in New York City, where the packet takes four more hops. The packet is then forwarded to BBN Planet in College Park (MD). 3 The packet is sent to BBN Planet's router at MAE-East, MFS Datanet's Network Access Point (NAP) in Washington, D.C. MAE stands for Metropolitan Area Exchange, and is a Fiber Distributed Data Interface (FDDI) ring interconnecting routers from subscribing ISPs. The packet is then forwarded to NETCOM, Hill Associates' ISP. 4 The packet now travels through NETCOM's T3 backbone, following links from Washington, D.C. to Chicago to Santa Clara (CA), to San Jose (CA). 5 The packet is now sent to Hill Associates router (again, a system designated only by an IP address since the NETCOM side of the router was not named) and then passed to the target system. Note that the host's real name is not www.hill.com, but syrup.hill.com. TECHNICAL NOTE: The original version of Traceroute works by sending a sequence of User Datagram Protocol (UDP) datagrams to an invalid port address at the remote host. Using the default settings, three datagrams are sent, each with a Time-To-Live (TTL) field value set to one. The TTL value of 1 causes the datagram to "timeout" as soon as it hits the first router in the path; this router will then respond with an ICMP Time Exceeded Message (TEM) indicating that the datagram has expired. Another three UDP messages are now sent, each with the TTL value set to 2, which causes the second router to return ICMP Kessler & Shepard Informational [Page 10] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 TEMs. This process continues until the packets actually reach the other destination. Since these datagrams are trying to access an invalid port at the destination host, ICMP Destination Unreachable Messages are returned indicating an unreachable port; this event signals the Traceroute program that it is finished! The Traceroute program displays the round-trip delay associated with each of the attempts. (Note that some current implementations of Traceroute use the Record-Route option in IP rather than the method described above.) As an aside, Traceroute did not begin life as a general-purpose utility, but as a quick-and-dirty debugging aid used to find a routing problem. The code (complete with comments!) is available by anonymous FTP in the file traceroute.tar.Z from the host ftp.ee.lbl.gov. (See Section 4.2 for a discussion of anonymous FTP.) ==================================================================== SMCVAX$ traceroute www.hill.com

traceroute to syrup.hill.com (199.182.20.3), 30 hops max, 38 byte
packets
 1  smc.bbnplanet.net (192.80.64.5)  10 ms  0 ms  0 ms
 2  131.192.48.105 (131.192.48.105)  0 ms  10 ms  10 ms
 3  cambridge1-cr4.bbnplanet.net (199.94.204.77)  40 ms  40 ms  50 ms
 4  cambridge1-br1.bbnplanet.net (4.0.1.205)  30 ms  50 ms  50 ms
 5  nyc1-br2.bbnplanet.net (4.0.1.121)  60 ms  60 ms  40 ms
 6  nyc2-br2.bbnplanet.net (4.0.1.154)  60 ms  50 ms  60 ms
 7  nyc2-br2.bbnplanet.net (4.0.1.154)  60 ms  40 ms  50 ms
 8  nyc2-br1.bbnplanet.net (4.0.1.54)  70 ms  60 ms  30 ms
 9  collegepk-br2.bbnplanet.net (4.0.1.21)  50 ms  50 ms  40 ms
10  maeeast.bbnplanet.net (4.0.1.18)  200 ms  170 ms  210 ms
11  fddi.mae-east.netcom.net (192.41.177.210)  60 ms  50 ms  70 ms
12  t3-2.was-dc-gw1.netcom.net (163.179.220.181)  70 ms  60 ms  50 ms
13  t3-2.chw-il-gw1.netcom.net (163.179.220.186)  70 ms  80 ms  80 ms
14  t3-2.scl-ca-gw1.netcom.net (163.179.220.190)  140 ms  110 ms  160
ms
15  t3-1.sjx-ca-gw1.netcom.net (163.179.220.193)  120 ms  130 ms  120
ms
16  198.211.141.8 (198.211.141.8)  220 ms  260 ms  240 ms
17  syrup.hill.com (199.182.20.3)  220 ms  240 ms  219 ms
SMCVAX$
====================================================================

Kessler & Shepard Informational [Page 11] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

4. The Two Fundamental Tools

 The two most basic tools for Internet applications are TELNET and the
 File Transfer Protocol (FTP). TELNET allows a user to login to a
 remote host over a TCP/IP network, while FTP, as the name implies,
 allows a user to move files between two TCP/IP hosts. These two
 utilities date back to the very early days of the ARPANET.

4.1. TELNET

 TELNET [27] is TCP/IP's virtual terminal protocol. Using TELNET, a
 user connected to one host can login to another host, appearing like
 a directly-attached terminal at the remote system; this is TCP/IP's
 definition of a virtual terminal. The general form of the TELNET
 command is:
    telnet [IP_address|host_name] [port]
 As shown, a TELNET connection is initiated when the user enters the
 telnet command and supplies either a host_name or IP_address; if
 neither are given, TELNET will ask for one once the application
 begins.
 In the example below, a user of a PC uses TELNET to attach to the
 remote host smcvax.smcvt.edu. Once logged in via TELNET, the user can
 do anything on the remote host that would be possible if connected
 via a directly-attached terminal or via modem. The commands that are
 subsequently used are those available on the remote system to which
 the user is attached. In the sample dialogue below, the user attached
 to SMCVAX will use basic VAX/VMS commands:
    o The dir command lists the files having a "COM" file extension.
    o The mail command enters the VMS MAIL subsystem; the dir command
    here lists waiting mail.
    o Ping checks the status of another host.
 When finished, the logout command logs the user off the remote host;
 TELNET automatically closes the connection to the remote host and
 returns control to the local system.
 It is important to note that TELNET is a very powerful tool, one that
 may provide users with access to many Internet utilities and services
 that might not be otherwise available. Many of these features are
 accessed by specifying a port number with the TELNET command, in
 addition to a host's address, and knowledge of port numbers provides
 another mechanism for users to access information with TELNET.

Kessler & Shepard Informational [Page 12] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 This guide discusses several TCP/IP and Internet utilities that require
 local client software, such as Finger, Whois, Archie, and Gopher. But
 what if your software does not include a needed client?  In some cases,
 TELNET may be used to access a remote client and provide the same
 functionality.
 This is done by specifying a port number with the TELNET command. Just
 as TCP/IP hosts have a unique IP address, applications on the host are
 associated with an address, called a port. Finger (see Section 3.3
 above), for example, is associated with the well-known port number 79.
 In the absence of a Finger client, TELNETing to port 79 at a remote host
 may provide the same information. You can finger another host with
 TELNET by using a command like:
                          telnet host_name 79
 Other well-known TCP port numbers include 25 (Simple Mail Transfer
 Protocol), 43 (whois), 80 (Hypertext Transfer Protocol), and 119
 (Network News Transfer Protocol).
 Some services are available on the Internet using TELNET and special
 port numbers. A geographical information database, for example, may
 be accessed by TELNETing to port 3000 at host martini.eecs.umich.edu
 and current weather information is available at port 3000 at host
 downwind.sprl.umich.edu.
====================================================================

C:> telnet smcvax.smcvt.edu FTP Software PC/TCP tn 3.10 01/24/95 02:40 Copyright © 1986-1995 by FTP Software, Inc. All rights reserved - Connected to St. Michael's College - Username: kumquat Password: St. Michael's College VAX/VMS System. Node SMCVAX. Last interactive login on Monday, 16-SEP-1996 15:47 Last non-interactive login on Wednesday, 6-MAR-1996 08:19 You have 1 new Mail message. Good Afternoon User KUMQUAT. Logged in on 17-SEP-1996 at 1:10 PM. User [GUEST,KUMQUAT] has 3225 blocks used, 6775 available, of 10000 authorized and permitted overdraft of 100 blocks on $1$DIA2 Kessler & Shepard Informational [Page 13] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 To see a complete list of news items, type: NEWS DIR To read a particular item, type NEWS followed by the name of the item you wish to read. SMCVAX$ dir *.com

Directory $1$DIA2:[GUEST.KUMQUAT]
BACKUP.COM;24         24  16-JUL-1990 16:22:46.68  (RWED,RWED,RE,)
DELTREE.COM;17         3  16-JUL-1990 16:22:47.58  (RWED,RWED,RE,)
EXPANDZ.COM;7          2  22-FEB-1993 10:00:04.35  (RWED,RWED,RE,)
FTSLOGBLD.COM;3        1  16-JUL-1990 16:22:48.57  (RWED,RWED,RE,)
FTSRRR.COM;2           1  16-JUL-1990 16:22:48.73  (RWED,RWED,RE,)
LOGIN.COM;116          5   1-DEC-1993 09:33:21.61  (RWED,RWED,RE,)
SNOOPY.COM;6           1  16-JUL-1990 16:22:52.06  (RWED,RWED,RE,)
SYLOGIN.COM;83         8  16-JUL-1990 16:22:52.88  (RWED,RWED,RE,RE)
SYSTARTUP.COM;88      15  16-JUL-1990 16:22:53.21  (RWED,RWED,RE,)
WATCH_MAIL.COM;1     173  10-MAY-1994 09:59:52.65  (RWED,RWED,RE,)
Total of 10 files, 233 blocks.

SMCVAX$ mail You have 1 new message. MAIL> dir

NEWMAIL
  # From                 Date        Subject
  1 IN%"ibug@plainfield. 15-SEP-1996 ANNOUNCE: Burlington WWW Conference

MAIL> exit SMCVAX$ ping kestrel.hill.com /n=5

PING HILL.COM (199.182.20.24): 56 data bytes
64 bytes from 199.182.20.24: icmp_seq=0 time=290 ms
64 bytes from 199.182.20.24: icmp_seq=1 time=260 ms
64 bytes from 199.182.20.24: icmp_seq=2 time=260 ms
64 bytes from 199.182.20.24: icmp_seq=3 time=260 ms
64 bytes from 199.182.20.24: icmp_seq=4 time=260 ms
  1. —KESTREL.HILL.COM PING Statistics—-

5 packets transmitted, 5 packets received, 0% packet loss

round-trip (ms)  min/avg/max = 260/266/290

SMCVAX$ logout KUMQUAT logged out at 17-SEP-1996 13:17:04.29 Connection #0 closed C:> ==================================================================== Kessler & Shepard Informational [Page 14] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 4.2. FTP FTP [26] is one of the most useful and powerful TCP/IP utilities for the general user. FTP allows users to upload and download files between local and remote hosts. Anonymous FTP, in particular, is commonly available at file archive sites to allow users to access files without having to pre-establish an account at the remote host. TELNET might, in fact, be used for this purpose but TELNET gives the user complete access to the remote system; FTP limits the user to file transfer activities. The general form of the FTP command is: ftp [IP_address|host_name] An FTP session can be initiated in several ways. In the example shown below, an FTP control connection is initiated to a host (the Defense Data Network's Network Information Center) by supplying a host name with the FTP command; optionally, the host's IP address in dotted decimal (numeric) form could be used. If neither host name nor IP address are supplied in the command line, a connection to a host can be initiated by typing open host_name or open IP_address once the FTP application has been started. The remote host will ask for a username and password. If a bona fide registered user of this host supplies a valid username and password, then the user will have access to any files and directories to which this username has privilege. For anonymous FTP access, the username anonymous is used. Historically, the password for the anonymous user (not shown in actual use) has been guest, although most systems today ask for the user's Internet e-mail address (and several sites attempt to verify that packets are coming from that address before allowing the user to login). The "help ?" command may be used to obtain a list of FTP commands and help topics available with your software; although not always shown, nearly all TCP/IP applications have a help command. An example of the help for FTP's type command is shown in the sample dialogue. This command is very important one, by the way; if transferring a binary or executable file, be sure to set the type to image (or binary on some systems). The dir command provides a directory listing of the files in the current directory at the remote host; the UNIX ls command may also usually be used. Note that an FTP data transfer connection is established for the transfer of the directory information to the local host. The output from the dir command will show a file listing that is consistent with the native operating system of the remote Kessler & Shepard Informational [Page 15] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 host. Although the TCP/IP suite is often associated with UNIX, it can (and does) run with nearly all common operating systems. The directory information shown in the sample dialogue happens to be in UNIX format and includes the following information: o File attributes. The first character identifies the type of file entry as a directory (d), link or symbolic name (l), or individual file (-). The next nine characters are the file access permissions list; the first three characters are for the owner, the next three for the owner's group, and the last three for all other users. Three access privileges may be assigned to each file for each of these roups: read ®, write (w), and execute (x). o Number of entries, or hard links, in this structure. This value will be a "1" if the entry refers to a file or link, or will be the number of files in the listed directory. o File owner o File owner's group. o File size, in bytes. o Date and time of last modification. If the date is followed by a timestamp, then the date is from the current year. o File name. After the directory information has been transferred, FTP closes the data transfer connection. The command cd is used to change to another working directory, in this case the rfc directory (note that file and directory names may be case-sensitive). As in DOS, "cd .." will change to the parent of the current directory. The CWD command successful is the only indication that the user's cd command was correctly executed; the show-directory (may be truncated to fewer characters, as shown) command, if available, may be used to see which working directory you are in. Another dir command is used to find all files with the name rfc173*.txt; note the use of the * wildcard character. We can now copy (download) the file of choice (RFC 1739 is the previous version of this primer) by using the get (or receive) command, which has the following general format: get remote_file_name local_file_name FTP opens another data transfer connection for this file transfer purpose; note that the effective data transfer rate is 93.664 kbps. FTP's put (or send) command allows uploading from the local host to the remote. Put is often not available when using anonymous FTP. Kessler & Shepard Informational [Page 16] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 Finally, we terminate the FTP connection by using the close command. The user can initiate another FTP connection using the open command or can leave FTP by issuing a quit command. Quit can also be used to close a connection and terminate a session. TECHNICAL NOTE: It is important to note that different FTP packages have different commands available and even those with similar names may act differently. In the example shown here (using MultiNet for VMS), the show command will display the current working directory; in FTP Software's OnNet, show will display a file from the remote host at the local host. Some packages have nothing equivalent to either of these commands. ==================================================================== SMCVAX$ ftp nic.ddn.mil

SMCVAX.SMCVT.EDU MultiNet FTP user process 3.4(111)
Connection opened (Assuming 8-bit connections)
<*****Welcome to the DOD Network Information Center*****
<    *****Login with username "anonymous" and password "guest"

Username: anonymous <Guest login ok, send "guest" as password. Password: guest ←– Not displayed

<Guest login ok, access restrictions apply.

NIC.DDN.MIL> help type TYPE Set the transfer type to type. Format TYPE type Additional information available: Parameters Example Restrictions TYPE Subtopic? parameters

TYPE
  Parameters
    type
       Specify a value of ASCII, BACKUP, BINARY, IMAGE or LOGICAL-
       BYTE.
       Use TYPE ASCII (the default) for transferring text files.
       Use TYPE BACKUP to set the transfer type to IMAGE and write the
       local file with 2048-byte fixed length records. Use this
       command to transfer VAX/VMS BACKUP save sets.

Kessler & Shepard Informational [Page 17] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

       Use TYPE BINARY to transfer binary files (same as TYPE IMAGE).
       Use TYPE IMAGE to transfer binary files (for example, .EXE).
       Use TYPE LOGICAL-BYTE to transfer binary files to or from a
       TOPS-20 machine.

TYPE Subtopic? Topic?

NIC.DDN.MIL> dir <Opening ASCII mode data connection for /bin/ls. total 58 drwxr-xr-x 2 nic 1 512 Sep 16 23:00 bcp drwxr-xr-x 2 root 1 512 Mar 19 1996 bin drwxr-xr-x 2 nic 1 1536 Jul 15 23:00 ddn-news drwxr-xr-x 2 nic 1 512 Mar 19 1996 demo drwxr-xr-x 2 nic 1 512 Mar 25 14:25 dev drwxr-xr-x 2 nic 10 512 Mar 19 1996 disn_info drwxr-xr-x 2 nic 1 512 Sep 17 07:01 domain drwxr-xr-x 2 nic 1 512 Mar 19 1996 etc lrwxrwxrwx 1 nic 1 3 Mar 19 1996 fyi → rfc drwxr-xr-x 2 nic 10 1024 Sep 16 23:00 gosip drwxr-xr-x 2 nic 1 512 Mar 19 1996 home drwxr-xr-x 2 nic 1 512 Mar 19 1996 lost+found lrwxrwxrwx 1 nic 1 8 Mar 19 1996 mgt → ddn-news drwxr-xr-x 2 nic 1 1024 Sep 13 12:11 netinfo drwxr-xr-x 4 nic 1 512 May 3 23:00 netprog drwxr-xr-x 2 nic 1 1024 Mar 19 1996 protocols drwxr-xr-x 2 nic 1 512 Mar 19 1996 pub drwxr-xr-x 3 140 10 512 Aug 27 21:03 registrar drwxr-xr-x 2 nic 1 29696 Sep 16 23:00 rfc drwxr-xr-x 2 nic 1 5632 Sep 9 23:00 scc drwxr-xr-x 2 nic 1 1536 Sep 16 23:00 std drwxr-xr-x 2 nic 1 1024 Sep 16 23:00 templates drwxr-xr-x 3 nic 1 512 Mar 19 1996 usr <Transfer complete. 1437 bytes transferred at 33811 bps. Run time = 20. ms, Elapsed time = 340. ms. NIC.DDN.MIL> cd rfc

<CWD command successful.

NIC.DDN.MIL> show <"/rfc" is current directory. NIC.DDN.MIL> dir rfc173*.txt

Kessler & Shepard Informational [Page 18] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

<Opening ASCII mode data connection for /bin/ls.
-rw-r--r--  1 nic      10         156660 Dec 20  1994 rfc1730.txt
-rw-r--r--  1 nic      10          11433 Dec 20  1994 rfc1731.txt
-rw-r--r--  1 nic      10           9276 Dec 20  1994 rfc1732.txt
-rw-r--r--  1 nic      10           6205 Dec 20  1994 rfc1733.txt
-rw-r--r--  1 nic      10           8499 Dec 20  1994 rfc1734.txt
-rw-r--r--  1 nic      10          24485 Sep 15  1995 rfc1735.txt
-rw-r--r--  1 nic      10          22415 Feb  8  1995 rfc1736.txt
-rw-r--r--  1 nic      10          16337 Dec 15  1994 rfc1737.txt
-rw-r--r--  1 nic      10          51348 Dec 15  1994 rfc1738.txt
-rw-r--r--  1 nic      10         102676 Dec 21  1994 rfc1739.txt
<Transfer complete.
670 bytes transferred at 26800 bps.
Run time = 10. ms, Elapsed time = 200. ms.

NIC.DDN.MIL> get rfc1739.txt primer.txt <Opening ASCII mode data connection for rfc1739.txt (102676 bytes). <Transfer complete. 105255 bytes transferred at 93664 bps. Run time = 130. ms, Elapsed time = 8990. ms. NIC.DDN.MIL> quit

<Goodbye.
SMCVAX$
====================================================================

5. User Database Lookup Tools

 Finding other users on the Internet is an art, not a science.
 Although there is a distributed database listing all of the 16+
 million hosts on the Internet, no similar database yet exists for the
 tens of millions of users. While many commercial ISPs provide
 directories of the users of their network, these databases are not
 yet linked. The paragraphs below will discuss some of the tools
 available for finding users on the Internet.

5.1. WHOIS/NICNAME

 WHOIS and NICNAME are TCP/IP applications that search databases to
 find the name of network and system administrators, RFC authors,
 system and network points-of-contact, and other individuals who are
 registered in appropriate databases. The original NICNAME/WHOIS
 protocol is described in RFC 954 [10].
 WHOIS may be accessed by TELNETing to an appropriate WHOIS server and
 logging in as whois (no password is required); the most common
 Internet name server is located at the Internet Network Information
 Center (InterNIC) at rs.internic.net. This specific database only

Kessler & Shepard Informational [Page 19] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 contains INTERNET domains, IP network numbers, and domain points of
 contact; policies governing the InterNIC database are described in
 RFC 1400 [31].  The MILNET database resides at nic.ddn.mil and PSI's
 White Pages pilot service is located at psi.com.
 Many software packages contain a WHOIS/NICNAME client that
 automatically establishes the TELNET connection to a default name
 server database, although users can usually specify any name server
 database that they want.
 The accompanying dialogues shows several types of WHOIS/NICNAME
 information queries. In the session below, we request information
 about an individual (Denis Stratford) by using WHOIS locally, a
 specific domain (hill.com) by using NICNAME locally, and a network
 address (199.182.20.0) and high-level domain (com) using TELNET to a
 WHOIS server.
====================================================================

SMCVAX$ whois stratford, denis Stratford, Denis (DS378) denis@@SMCVAX.SMCVT.EDU St. Michael's College Jemery Hall, Room 274 Winooski Park Colchester, VT 05439 (802) 654-2384 Record last updated on 02-Nov-92. SMCVAX$ C:> nicname hill.com

[198.41.0.5]
Hill Associates (HILL-DOM)
   17 Roosevelt Hwy.
   Colchester, Vermont 05446
   US
   Domain Name: HILL.COM
   Administrative Contact:
      Kessler, Gary C.  (GK34)  g.kessler@HILL.COM
      802-655-0940
   Technical Contact, Zone Contact:
      Monaghan, Carol A.  (CAM4)  c.monaghan@HILL.COM
      802-655-0940

Kessler & Shepard Informational [Page 20] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

   Billing Contact:
      Parry, Amy  (AP1257)  a.parry@HILL.COM
      802-655-0940
   Record last updated on 11-Jun-96.
   Record created on 11-Jan-93.
   Domain servers in listed order:
   SYRUP.HILL.COM            199.182.20.3
   NS1.NOC.NETCOM.NET        204.31.1.1

C:> telnet rs.internic.net SunOS UNIX 4.1 (rs1) (ttypb) *

  • – InterNIC Registration Services Center –
  • For wais, type: WAIS <search string> <return>
  • For the *original* whois type: WHOIS [search string] <return>
  • For referral whois type: RWHOIS [search string] <return>
  • *

Please be advised that use constitutes consent to monitoring

(Elec Comm Priv Act, 18 USC 2701-2711)

[vt220] InterNIC > whois InterNIC WHOIS Version: 1.2 Wed, 18 Sep 96 09:49:50 Whois: 199.182.20.0

Hill Associates (NET-HILLASSC)
   17 Roosevelt Highway
   Colchester, VT  05446
   Netname: HILLASSC
   Netnumber: 199.182.20.0
   Coordinator:
      Monaghan, Carol A.  (CAM4)  c.monaghan@HILL.COM
      802-655-0940
   Record last updated on 17-May-94.

Kessler & Shepard Informational [Page 21] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

Whois: com-dom Commercial top-level domain (COM-DOM) Network Solutions, Inc. 505 Huntmar park Dr. Herndon, VA 22070 Domain Name: COM Administrative Contact, Technical Contact, Zone Contact: Network Solutions, Inc. (HOSTMASTER) hostmaster@INTERNIC.NET (703) 742-4777 (FAX) (703) 742-4811 Record last updated on 02-Sep-94. Record created on 01-Jan-85. Domain servers in listed order: A.ROOT-SERVERS.NET 198.41.0.4 H.ROOT-SERVERS.NET 128.63.2.53 B.ROOT-SERVERS.NET 128.9.0.107 C.ROOT-SERVERS.NET 192.33.4.12 D.ROOT-SERVERS.NET 128.8.10.90 E.ROOT-SERVERS.NET 192.203.230.10 I.ROOT-SERVERS.NET 192.36.148.17 F.ROOT-SERVERS.NET 192.5.5.241 G.ROOT-SERVERS.NET 192.112.36.4 Would you like to see the known domains under this top-level domain? n

Whois: exit [vt220] InterNIC > quit

Wed Sep 18 09:50:29 1996 EST
Connection #0 closed
C:>
====================================================================

Kessler & Shepard Informational [Page 22] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

5.2. KNOWBOT

 KNOWBOT is an automated username database search tool that is related
 to WHOIS. The Knowbot Information Service (KIS), operated by the
 Corporation for National Research Initiatives (CNRI) in Reston,
 Virginia, provides a simple WHOIS-like interface that allows users to
 query several Internet user databases (White Pages services) all at
 one time. A single KIS query will automatically search the InterNIC,
 MILNET, MCImail, and PSI White Pages Pilot Project; other databases
 may also be included.
 KNOWBOT may be accessed by TELNETing to host info.cnri.reston.va.us.
 The help command will supply sufficient information to get started.
 The sample dialogue below shows use of the query command to locate a
 user named "Steven Shepard"; this command automatically starts a
 search through the default set of Internet databases.
====================================================================

C:> telnet info.cnri.reston.va.us Knowbot Information Service KIS Client (V2.0). Copyright CNRI 1990. All Rights Reserved. KIS searches various Internet directory services to find someone's street address, email address and phone number. Type 'man' at the prompt for a complete reference with examples. Type 'help' for a quick reference to commands. Type 'news' for information about recent changes. Please enter your email address in our guest book… (Your email address?) > s.shepard@hill.com

> query shepard, steven Trying whois at ds.internic.net… The ds.internic.net whois server is being queried: Nothing returned. The rs.internic.net whois server is being queried: Shepard, Steven (SS2192) 708-810-5215 Shepard, Steven (SS1302) axisteven@AOL.COM (954) 974-4569 Kessler & Shepard Informational [Page 23] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 The nic.ddn.mil whois server is being queried: Shepard, Steven (SS2192) R.R. Donnelley & Sons 750 Warrenville Road Lisle, IL 60532 Trying mcimail at cnri.reston.va.us… Trying ripe at whois.ripe.net… Trying whois at whois.lac.net… No match found for .SHEPARD,STEVEN > quit

KIS exiting
Connection #0 closed
C:>
====================================================================

6. Information Servers

 File transfer, remote login, and electronic mail remained the primary
 applications of the ARPANET/Internet until the early 1990s. But as
 the Internet user population shifted from hard-core computer
 researchers and academics to more casual users, easier-to-use tools
 were needed for the Net to become accepted as a useful resource. That
 means making things easier to find. This section will discuss some of
 the early tools that made it easier to locate and access information
 on the Internet.

6.1. Archie

 Archie, developed in 1992 at the Computer Science Department at
 McGill University in Montreal, allows users to find software, data,
 and other information files that reside at anonymous FTP archive
 sites; the name of the program, reportedly, is derived from the word
 "archive" and not from the comic book character. Archie tracks the
 contents of several thousand anonymous FTP sites containing millions
 of files. The archie server automatically updates the information
 from each registered site about once a month, providing relatively
 up-to-date information without unduly stressing the network. Archie,
 however, is not as popular as it once was and many sites have not
 updated their information; as the examples below show, many of the
 catalog listings are several years old.

Kessler & Shepard Informational [Page 24] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 Before using archie, you must identify a server address. The sites
 below all support archie; most (but not all) archie sites support the
 servers command which lists all known archie servers. Due to the
 popularity of archie at some sites and its high processing demands,
 many sites limit access to non-peak hours and/or limit the number of
 simultaneous archie users. Available archie sites include:
   archie.au                       archie.rediris.es
   archie.edvz.uni-linz.ac.at      archie.luth.se
   archie.univie.ac.at             archie.switch.ch
   archie.uqam.ca                  archie.ncu.edu.tw
   archie.funet.fi                 archie.doc.ic.ac.uk
   archie.th-darmstadt.de          archie.unl.edu
   archie.ac.il                    archie.internic.net
   archie.unipi.it                 archie.rutgers.edu
   archie.wide.ad.jp               archie.ans.net
   archie.kr                       archie.sura.net
   archie.sogang.ac.kr
 All archie sites can be accessed using archie client software. Some
 archie servers may be accessed using TELNET; when TELNETing to an
 archie site, login as archie (you must use lower case) and hit
 <ENTER> if a password is requested.
 Once connected, the help command assists users in obtaining more
 information about using archie. Two more useful archie commands are
 prog, used to search for files in the database, and whatis, which
 searches for keywords in the program descriptions.
 In the accompanying dialogue, the set maxhits command is used to
 limit the number of responses to any following prog commands; if this
 is not done, the user may get an enormous amount of information.  In
 this example, the user issues a request to find entries related to
 "dilbert"; armed with this information, a user can use anonymous FTP
 to examine these directories and files.
 The next request is for files with "tcp/ip" as a keyword descriptor.
 These responses can be used for subsequent prog commands.
 Exit archie using the exit command. At this point, TELNET closes the
 connection and control returns to the local host.

Kessler & Shepard Informational [Page 25] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 Additional information about archie can be obtained by sending e-mail
 to Bunyip Information Systems (archie-info@bunyip.com). Client
 software is not required to use archie, but can make life a little
 easier; some such software can be downloaded using anonymous FTP from
 the /pub/archie/clients/ directory at ftp.sura.net (note that the
 newest program in this directory is dated June 1994). Most shareware
 and commercial archie clients hide the complexity described in this
 section; users usually connect to a pre-configured archie server
 merely by typing an archie command line.
====================================================================

C:> telnet archie.unl.edu SunOS UNIX (crcnis2) login: archie Password: Welcome to the ARCHIE server at the University of Nebraska - Lincoln # Bunyip Information Systems, 1993 unl-archie> help

These are the commands you can use in help:
          .    go up one level in the hierarchy
          ?    display a list of valid subtopics at the current level
<newline>
done, ^D, ^C  quit from help entirely
     <string>  help on a topic or subtopic
Eg.
      "help show"
will give you the help screen for the "show" command
      "help set search"
Will give you the help information for the "search" variable.
The command "manpage" will give you a complete copy of the archie
manual page.

help> done unl-archie> set maxhits 5

unl-archie> prog dilbert Kessler & Shepard Informational [Page 26] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 # Search type: sub. # Your queue position: 2 # Estimated time for completion: 00:20 Host ftp.wustl.edu (128.252.135.4) Last updated 10:08 25 Dec 1993 Location: /multimedia/images/gif/unindexed/931118 FILE -rw-r–r– 9747 bytes 19:18 17 Nov 1993 dilbert.gif unl-archie> whatis tcp/ip

RFC                       1065          McCloghrie, K.; Rose, M.T.
Structure and identification of management information for TCP/IP-based
internets. 1988 August; 21 p. (Obsoleted by RFC 1155)
RFC                       1066          McCloghrie, K.; Rose, M.T.
Management Information Base for network management of TCP/IP-based
internets. 1988 August; 90 p. (Obsoleted by RFC 1156)
RFC                       1085          Rose, M.T. ISO presentation
services on top of TCP/IP based internets. 1988 December; 32 p.
RFC                       1095          Warrier, U.S.; Besaw, L. Common
Management Information Services and Protocol over TCP/IP (CMOT). 1989
April; 67 p. (Obsoleted by RFC 1189)
RFC                       1144          Jacobson, V. Compressing TCP/IP
headers for low-speed serial links. 1990 February; 43 p.
RFC                       1147          Stine, R.H.,ed. FYI on a
network management tool catalog: Tools for monitoring and debugging
TCP/IP internets and interconnected devices. 1990 April; 126 p. (Also
FYI 2)
RFC                       1155          Rose, M.T.; McCloghrie, K.
Structure and identification of management information for TCP/IP-based
internets. 1990 May; 22 p. (Obsoletes RFC 1065)
RFC                       1156          McCloghrie, K.; Rose, M.T.
Management Information Base for network management of TCP/IP-based
internets. 1990 May; 91 p. (Obsoletes RFC 1066)
RFC                       1158          Rose, M.T.,ed. Management
Information Base for network management of TCP/IP-based internets:
MIB-II. 1990 May; 133 p.
RFC                       1180          Socolofsky, T.J.; Kale, C.J.
TCP/IP tutorial. 1991 January; 28 p.
RFC                       1195          Callon, R.W. Use of OSI
IS-IS for routing in TCP/IP and dual environments. 1990 December; 65 p.
RFC                       1213          McCloghrie, K.; Rose,M.T.,eds.
Management Information Base for network management of TCP/IP-based
internets:MIB-II.  1991 March; 70 p. (Obsoletes RFC 1158)
log_tcp                   Package to monitor tcp/ip connections
ping                      PD version of the ping(1) command. Send ICMP
ECHO requests to a host on the network (TCP/IP) to see whether it's
reachable or not

Kessler & Shepard Informational [Page 27] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

unl-archie> exit # Bye. Connection #0 closed C:> ==================================================================== 6.2. Gopher The Internet Gopher protocol was developed at the University of Minnesota's Microcomputer Center in 1991, as a distributed information search and retrieval tool for the Internet. Gopher is described in RFC 1436 [1]; the name derives from the University's mascot. Gopher provides a tool so that publicly available information at a host can be organized in a hierarchical fashion using simple text descriptions, allowing files to be perused using a simple menu system. Gopher also allows a user to view a file on demand without requiring additional file transfer protocols. In addition, Gopher introduced the capability of linking sites on the Internet, so that each Gopher site can be used as a stepping stone to access other sites and reducing the amount of duplicate information and effort on the network. Any Gopher site can be accessed using Gopher client software (or a WWW browser). In many cases, users can access Gopher by TELNETing to a valid Gopher location; if the site provides a remote Gopher client, the user will see a text-based, menu interface. The number of Gopher sites grew rapidly between 1991 and 1994, although growth tapered due to the introduction of the Web; in any case, most Gopher sites have a menu item that will allow you to identify other Gopher sites. If using TELNET, login with the username gopher (this must be in lowercase); no password is required. In the sample dialogue below, the user attaches to the Gopher server at the Internet Network Information Center (InterNIC) by TELNETing to ds.internic.net. With the menu interface shown here, the user merely follows the prompts. Initially, the main menu will appear. Selecting item 3 causes Gopher to seize and display the "InterNIC Registration Services (NSI)" menu; move to the desired menu item by typing the item number or by moving the pointer (–>) down to the desired entry using the DOWN-ARROW key on the keyboard, and then hitting ENTER. To quit the program at any time, press q (quit); ? and u will provide help or go back up to the previous menu, respectively. Users may also search for strings within files using the / command or download the file being interrogated using the D command. Kessler & Shepard Informational [Page 28] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 Menu item 1 within the first submenu (selected in the dialogue shown here) is titled "InterNIC Registration Archives." As its submenu implies, this is a place to obtain files containing the InterNIC's domain registration policies, domain data, registration forms, and other information related to registering names and domains on the Internet. ==================================================================== SMCVAX$ telnet ds.internic.net

UNIX(r) System V Release 4.0 (ds2)

login: gopher Welcome to the InterNIC Directory and Database Server. Internet Gopher Information Client v2.1.3 Home Gopher server: localhost –> 1. About InterNIC Directory and Database Services/ 2. InterNIC Directory and Database Services (AT&T)/ 3. InterNIC Registration Services (NSI)/ 4. README Press ? for Help, q to Quit Page: 1/1 View item number: 3

                 Internet Gopher Information Client v2.1.3
                      InterNIC Registration Services (NSI)
  1. → 1. InterNIC Registration Archives/

2. Whois Searches (InterNIC IP, ASN, DNS, and POC Registry) <?>

Press ? for Help, q to Quit, u to go up a menu              Page: 1/1

View item number: 1 Internet Gopher Information Client v2.1.3 InterNIC Registration Archives –> 1. archives/ 2. domain/ 3. netinfo/ 4. netprog/ 5. policy/ 6. pub/ 7. templates/ Kessler & Shepard Informational [Page 29] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 Press ? for Help, q to Quit, u to go up a menu Page: 1/1 q Really quit (y/n) ? y Connection closed by Foreign Host SMCVAX$ ==================================================================== 6.3. VERONICA, JUGHEAD, and WAIS The problem with being blessed with so much information from FTP, archie, Gopher, and other sources is exactly that – too much information. To make it easier for users to locate the system on which their desired information resides, a number of other tools have been created. VERONICA (Very Easy Rodent-Oriented Net-wide Index to Computerized Archives) was developed at the University of Nevada at Reno as an archie- like adjunct to Gopher. As the number of Gopher sites quickly grew after its introduction, it became increasingly harder to find information in gopherspace since Gopher was designed to search a single database at a time. VERONICA maintains an index of titles of Gopher items and performs a keyword search on all of the Gopher sites that it has knowledge of and access to, obviating the need for the user to perform a menu-by-menu, site-by-site search for information. When a user selects an item from the menu of a VERONICA search, "sessions" are automatically established with the appropriate Gopher servers, and a list of data items is returned to the originating Gopher client in the form of a Gopher menu so that the user can access the files. VERONICA is available as an option on many Gopher servers. Another Gopher-adjunct is JUGHEAD (Jonzy's Universal Gopher Hierarchy Excavation And Display). JUGHEAD supports key word searches and the use of logical operators (AND, OR, and NOT). The result of a JUGHEAD search is a display of all menu items which match the search string which are located in the University of Manchester and UMIST Information Server, working from a static database that is re-created every day. JUGHEAD is available from many Gopher sites, although VERONICA may be a better tool for global searches. The Wide Area Information Server (WAIS, pronounced "ways") was initiated jointly by Apple Computer, Dow Jones, KMPG Peat Marwick, and Thinking Machines Corp. It is a set of free-ware, share-ware, and commercial software products for a wide variety of hardware/software platforms, which work together to help users find information on the Internet. WAIS provides a single interface through which a user can Kessler & Shepard Informational [Page 30] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 access many different information databases. The user interface allows a query to be formulated in English and the WAIS server will automatically choose the appropriate databases to search. Further information about WAIS can be obtained by reading the WAIS FAQ, from host rtfm.mit.edu in file /pub/usenet/news.answers/wais-faq. 7. The World Wide Web The World Wide Web (WWW) is thought (erroneously) by many to be the same thing as the Internet. But the confusion, in many ways, is justified; by early 1996, the WWW accounted for over 40% of all of the traffic on the Internet. In addition, the number of hosts on the Internet named www has grown from several hundred in mid-1994 to 17,000 in mid-1995 to 212,000 in mid-1996 to over 410,000 by early 1997. The Web has made information on the Internet accessible to users of all ages and computer skill levels. It has provided a mechanism so that nearly anyone can become a content provider. According to some, growth in the number of WWW users is unparalleled by any other event in human history. The WWW was developed in the early 1990s at the CERN Institute for Particle Physics in Geneva, Switzerland. The Web was designed to combine aspects of information retrieval with multimedia communications, unlike archie and Gopher, which were primarily used for the indexing of text-based files. The Web allows users to access information in many different types of formats, including text, sound, image, animation, and video. WWW treats all searchable Internet files as hypertext documents. Hypertext is a term which merely refers to text that contains pointers to other text, allowing a user reading one document to jump to another document for more information on a given topic, and then return to the same location in the original document. WWW hypermedia documents are able to employ images, sound, graphics, video, and animation in addition to text. To access WWW servers, users must run client software called a browser. The browser and server use the Hypertext Transfer Protocol (HTTP) [3]. WWW documents are written in the Hypertext Markup Language (HTML) [2, 20], a simple text-based formatting language that is hardware and software platform-independent. Users point the browser at some location using a shorthand format called a Uniform Resource Locator (URL), which allows a WWW servers to obtain files from any location on the public Internet using a variety of protocols, including HTTP, FTP, Gopher, and TELNET. Mosaic, developed in 1994 at the National Center for Supercomputer Applications (NCSA) at the University of Illinois at Urbana- Champaign, was the first widely-used browser. Because it was available at no cost over the Internet via anonymous FTP, and had a Kessler & Shepard Informational [Page 31] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 version for Windows, Mac, and UNIX systems, Mosaic was probably the single reason that the Web attracted so many users so quickly. The most commonly used browsers today include the Netscape Navigator (http://www.netscape.com), Microsoft's Internet Explorer (http://www.microsoft.com), and NCSA Mosaic (http://www.ncsa.uiuc.edu/SDG/Software/Mosaic/). The WWW is ideally suited to a windows environment, or other point- and-click graphical user interface. Nevertheless, several text-based Web browsers do exist, although their usefulness is limited if trying to obtain graphical images, or audio or video clips. One text-based Web browser is Lynx, and an example of its use is shown below. Items in square brackets in the sample dialogue are Lynx's way of indicating an image or other display that cannot be shown on an ASCII terminal. ==================================================================== gck@zoo.uvm.edu> lynx www.hill.com

Getting http://www.hill.com/
Looking up www.hill.com.
Making HTTP connection to www.hill.com.Sending HTTP request.
HTTP request sent; waiting for response.Read 176 bytes of data.
512 of 2502 bytes of data.
1024 of 2502 bytes of data.
536
2048
502
Data transfer complete
               Hill Associates
   [INLINE] Hill Associates, Inc.
Leaders in Telecommunications Training and Education Worldwide
_________________________________________________________________
Hill Associates is an international provider of voice and data
telecommunications training and education. We cover the full breadth
of the field, including telephony, computer networks, ISDN, X.25 and
fast packet technologies (frame relay, SMDS, ATM), wireless, TCP/IP
and the Internet, LANs and LAN interconnection, legacy networks,
multimedia and virtual reality, broadband services, regulation,
service strategies, and network security.
Hill Associates' products and services include instructor-led,
computer-based (CBT), and hands-on workshop courses. Courseware
distribution media include audio tape, video tape, CD-ROM, and 3.5"
disks (PC).

Kessler & Shepard Informational [Page 32] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

_________________________________________________________________
Hill Associates products, services, and corporate information
  • About Hill Associates
  • HAI Products and Services Catalog
  • Datacomm/2000-ED Series
  • Contacting Hill Associates
  • Employment Opportunities
  • HAI Personnel Home Pages
On-line information resources from Hill Associates
  • HAI Telecommunications Acronym List
  • Articles, Books, and On-Line Presentations by HAI Staff
  • GCK's Miscellaneous Sites List…
Hill Associates is host to the:
  • IEEE Local Computer Networks Conference Home Page…
  • Vermont Telecommunications Resource Center

Please send any comments or suggestions to the HAI Webmaster. Come
back again soon!
Information at this site (c) 1994-1997 Hill Associates.
Arrow keys: Up and Down to move. Right to follow a link; Left to go
back.
H)elp O)ptions P)rint G)o M)ain screen Q)uit /=search
[delete]=history list

G URL to open: http://www.bbn.com

Getting http://www.bbn.com/
Looking up www.bbn.com.
Making HTTP connection to www.bbn.com.Sending HTTP request.
HTTP request sent; waiting for response.Read 119 bytes of data.
500
1000 bytes of data.
2
5
925
Data transfer complete
BBN On The World Wide Web

Kessler & Shepard Informational [Page 33] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

[LINK]
 BBN Reports Fourth-Quarter and Year-End 1996 Results
[INLINE]
[ISMAP]
[ISMAP]
[LINK]
[INLINE]
Who Won Our Sweepstakes
How The Noc Solves Problems
Noc Noc Who's There
BBN Planet Network Map
[LINK][LINK][LINK][LINK][LINK][LINK]
[LINK]
Contact BBN Planet
Directions to BBN
Text only index of the BBN Web site
|
Corporate Disclaimer
Send questions and comments about our site to Webmaster@bbn.com
(c) 1996 BBN Corporation
Arrow keys: Up and Down to move. Right to follow a link; Left to go
back.
H)elp O)ptions P)rint G)o M)ain screen Q)uit /=search
[delete]=history list

Q gck@zoo.uvm.edu> ==================================================================== 7.1. Uniform Resource Locators As more and more protocols have become available to identify files, archive and server sites, news lists, and other information resources on the Internet, it was inevitable that some shorthand would arise to make it easier to designate these sources. The common shorthand format is called the Uniform Resource Locator. The list below provides information on how the URL format should be interpreted for the protocols and resources that will be discussed in this document. A complete description of the URL format may be found in [4]. Kessler & Shepard Informational [Page 34] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 file:host/directory/file-name Identifies a specific file. E.g., the file htmlasst in the edu directory at host ftp.cs.da would be denoted, using the full URL form: <URL:file:ftp.cs.da/edu/htmlasst>. ftp://user:password@host:port/directory/file-name Identifies an FTP site. E.g.: ftp://ftp.eff.org/pub/EFF/Policy/Crypto/*. gopher://host:port/gopher-path Identifies a Gopher site and menu path; a "00" at the start of the path indicates a directory and "11" indicates a file. E.g.: gopher://info.umd.edu:901/00/info/Government/Factbook92. http://host:port/directory/file-name?searchpart Identifies a WWW server location. E.g.: http://info.isoc.org/home.html. mailto:e-mail_address Identifies an individual's Internet mail address. E.g.: mailto:s.shepard@hill.com. telnet://user:password@host:port/ Identifies a TELNET location (the trailing "/" is optional). E.g.: telnet://envnet:henniker@envnet.gsfc.nasa.gov. 7.2. User Directories on the Web While finding users on the Internet remains somewhat like alchemy if using the tools and utilities mentioned earlier, the Web has added a new dimension to finding people. Since 1995, many telephone companies have placed national white and yellow page telephone directories on- line, accessible via the World Wide Web. For a while, it seemed that the easiest and most reliable approach to finding people's e-mail address on the Internet was to look up their telephone number on the Web, call them, and ask for their e-mail address! More recently, however, many third parties are augmenting the standard telephone directory with an e-mail directory. These services primarily rely on users voluntarily registering, resulting in incomplete databases because most users don't know about all of the services. Nevertheless, some of the personal directory services available via the Web with which e-mail addresses (and telephone numbers) can be found include Four11 Directory Services (http://www.Four11.com/), Excite (http://www.excite.com/Reference/locators.html), and Yahoo! People Search (http://www.yahoo.com/search/people/). Kessler & Shepard Informational [Page 35] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 In addition, the Knowbot Information Service (KIS), CNRI's automated username database search tool described earlier in this document, is also available on the Web, at http://info.cnri.reston.va.us/kis.html. Users can select several options for the KIS search, including the InterNIC, MILNET, MCImail, and Latin American Internic databases; UNIX finger and whois servers; and X.500 databases. 7.3. Other Service Accessible Via the Web Many of the other utilities described earlier in this document can also be accessed via the WWW. In general, the Web browser acts as a viewer to a remote client rather than requiring specialized software on the user's system. Several sites provide DNS information, obviating the need for a user to have a local DNS client such as NSLOOKUP. The hosts http://ns1.milepost.com/dns/ and http://sh1.ro.com/~mprevost/netutils/dig.html are among the best DNS sites, allowing the user to access all DNS information. The site http://www.bankes.com/nslookup.htm allows users to do multiple, sequential searches at a given domain. Other Web sites providing simple DNS name/address translation services include http://rhinoceros.cs.inf.shizuoka.ac.jp/dns.html, http://www.engin.umich.edu/htbin/DNSquery, http://www.lublin.pl/cgi- bin/ns/nsgate, and http://www.trytel.com/cgi-bin/weblookup. Ping is another service available on the Web. The http://sh1.ro.com/~mprevost/netutils/ping.html page allows a user to select a host name, number of times to ping (1-10), and number of seconds between each ping (1-10), and returns a set of summary statistics. Other Web-based ping sites include http://www.net.cmu.edu/bin/ping (sends ten pings, and reports the times and min/max/avg summary statistics) and http://www.uia.ac.be/cc/ping.html (indicates whether the target host is alive or not). Traceroute is also available on the Web. Unfortunately, these servers trace the route from their host to a host that the user chooses, rather than from the user's host to the target. Nevertheless, interesting route information can be found at http://www.net.cmu.edu/bin/traceroute. Traceroute service and a list of a number of other traceroute sites on the Web can be found at http://www.lublin.pl/cgi-bin/trace/traceroute. Kessler & Shepard Informational [Page 36] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 Access to archie is also available via the WWW, where your browser acts as the graphical interface to an archie server. To find a list of archie servers, and to access them via the Web, point your browser at http://www.yahoo.com/Computers_and_Internet/Internet/FTP_Sites/ Searching/Archie/. Finally, even Finger can be found on the World Wide Web; check out http://sh1.ro.com/~mprevost/netutils/finger.html. 8. Discussion Lists and Newsgroups Among the most useful features of the Internet are the discussion lists that have become available to allow individuals to discuss topics of mutual concern. Discussion list topics range from SCUBA diving and home brewing of beer to AIDS research and foreign policy. Several, naturally, deal specifically with the Internet, TCP/IP protocols, and the impact of new technologies. Most of the discussion lists accessible from the Internet are unmoderated, meaning that anyone can send a message to the list's central repository and the message will then be automatically forwarded to all subscribers of the list. These lists provide very fast turn-around between submission of a message and delivery, but often result in a lot of messages (including inappropriate junk mail, or "spam"). A moderated list has an extra step; a human list moderator examines all messages before they are forwarded to ensure that the messages are appropriate to the list and not needlessly inflammatory! Users should be warned that some lists generate a large number of messages each day. Before subscribing to too many lists, be sure that you are aware of local policies and/or charges governing access to discussion lists and e-mail storage. 8.1. Internet Discussion Lists Mail can be sent to almost all Internet lists at an address with the following form: list_name@host_name The common convention when users want to subscribe, unsubscribe, or handle any other administrative matter is to send a message to the list administrator; do not send administrivia to the main list address! The list administrator can usually be found at: list_name-REQUEST@host_name Kessler & Shepard Informational [Page 37] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 To subscribe to a list, it is often enough to place the word "subscribe" in the main body of the message, although a line with the format: subscribe list_name your_full_name will satisfy most mail servers. A similar message may be used to get off a list; just use the word "unsubscribe" followed by the list name. Not every list follows this convention, but it is a safe bet if you don't have better information! 8.2. LISTSERV A large set of discussion groups is maintained using a program called LISTSERV. LISTSERV is a service provided widely on BITNET and EARN, although it is also available to Internet users. A LISTSERV User Guide can be found on the Web at http://www.earn.net/lug/notice.html. Mail can be sent to most LISTSERV lists at an address with the following form: list_name@host_name The common convention when users want to subscribe, unsubscribe, or handle any other administrative matter is to send commands in a message to the LISTSERV server; do not send administrivia to the main list address! The list server can usually be found at: LISTSERV@host_name LISTSERV commands are placed in the main body of e-mail messages sent to an appropriate list server location. Once you have found a list of interest, you can send a message to the appropriate address with any appropriate command, such as: subscribe list_name your_full_name Subscribe to a list unsubscribe list_name Unsubscribe from a list help Get help & a list of commands index Get a list of LISTSERV files get file_name Obtain a file from the server 8.3. Majordomo Majordomo is another popular list server for Internet discussion lists. The Web site http://www.greatcircle.com/majordomo/ has a large amount of information about Majordomo. Kessler & Shepard Informational [Page 38] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 Mail is sent to Majordomo lists using the same general address format as above: list_name@host_name The common convention when users want to subscribe, unsubscribe, or handle any other administrative matter is to send a message to the Majordomo list server; do not send administrivia to the main list address! The Majordomo server can usually be found at: MAJORDOMO@host_name Majordomo commands are placed in the main body of e-mail messages sent to an appropriate list server location. Available commands include: help Get help & a list of commands subscribe list_name your_e-mail Subscribe to a list (E-mail address is optional) unsubscribe list_name your_e-mail Unsubscribe from a list (E-mail address is optional) info list Sends an introduction about the specified list lists Get a list of lists served by this Majordomo server 8.4. Usenet Usenet, also known as NETNEWS or Usenet news, is another information source with its own set of special interest mailing lists organized into newsgroups. Usenet originated on UNIX systems but has migrated to many other types of hosts. Usenet clients, called newsreaders, use the Network News Transfer Protocol [13] and are available for virtually any operating system; several web browsers, in fact, have this capability built in. While Usenet newsgroups are usually accessible at Internet sites, a prospective Usenet client host must have appropriate newsreader software to be able to read news. Users will have to check with their local host or network administrator to find out what Usenet newsgroups are locally available, as well as the local policies for using them. Usenet newsgroup names are hierarchical in nature. The first part of the name, called the hierarchy, provides an indication about the general subject area. There are two types of hierarchies, called mainstream and alternative; the total number of newsgroups is in the thousands. The news.announce.newusers newsgroup is a good place for new Usenet users to find a detailed introduction to the use of Usenet, as well as an introduction to its culture. Kessler & Shepard Informational [Page 39] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 Usenet mainstream hierarchies are established by a process that requires the approval of a majority of Usenet members. Most sites that receive a NETNEWS feed receive all of these hierarchies, which include: comp Computers misc Miscellaneous news Network news rec Recreation sci Science soc Social issues talk Various discussion lists The alternative hierarchies include lists that may be set up at any site that has the server software and disk space. These lists are not formally part of Usenet and, therefore, may not be received by all sites getting NETNEWS. The alternative hierarchies include: alt Alternate miscellaneous discussion lists bionet Biology, medicine, and life sciences bit BITNET discussion lists biz Various business-related discussion lists ddn Defense Data Network gnu GNU lists ieee IEEE information info Various Internet and other networking information k12 K-12 education u3b AT&T 3B computers vmsnet Digital's VMS operating system 8.5 Finding Discussion Lists and Newsgroups Armed with the rules for signing up for a discussion list or accessing a newsgroup, how does one find an appropriate list given one's interests? There are tens of thousands of e-mail discussion lists on the Internet. One List of Lists may be found using anonymous FTP at ftp://sri.com/netinfo/interest-groups.txt; the List of Lists can be searched using a Web browser by going to http://catalog.com/vivian/interest-group-search.html. Other places to look are the Publicly Accessible Mailing Lists index at http://www.neosoft.com/internet/paml/byname.html and the LISZT Directory of E-Mail Discussion Groups at http://www.liszt.com. Kessler & Shepard Informational [Page 40] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 To obtain a list of LISTSERV lists, send e-mail to listserv@bitnic.cren.net with the command lists global in the body of the message. Alternatively, look on the Web at http://www.tile.net/tile/listserv/index.html. The Web site http://www.liszt.com has a Mailing Lists Database of lists served by LISTSERV and Majordomo. There are also thousands of Usenet newsgroups. One Usenet archive can be found at gopher://rtfm.mit.edu/11//pub/usenet/news.answers; see the /active-newsgroups and /alt-hierarchies subdirectories. Usenet news may also be read at gopher://gopher.bham.ac.uk/11/Usenet. A good Usenet search facility can be found at DejaNews at http://www.dejanews.com/; messages can also be posted to Usenet newsgroups from this site. Note that there is often some overlap between Usenet newsgroups and Internet discussion lists. Some individuals join both lists in these circumstances or, often, there is cross-posting of messages. Some Usenet newsgroup discussions are forwarded onto an Internet mailing list by an individual site to provide access to those users who do not have Usenet available. 9. Internet Documentation To fully appreciate and understand what is going on within the Internet community, users might wish to obtain the occasional Internet specification. The main body of Internet documents are Request for Comments (RFCs), although a variety of RFC subsets have been defined for various specific purposes. The sections below will describe the RFCs and other documentation, and how to get them. The Internet standardization process is alluded to in the following sections. The Internet Engineering Task Force (IETF) is the guiding body for Internet standards; their Web site is http://www.ietf.org. The IETF operates under the auspices of the Internet Society (ISOC), which has a Web site at http://www.isoc.org. For complete, up-to-date information on obtaining Internet documentation, go to the InterNIC's Web site at http://ds.internic.net/ds/dspg0intdoc.html. The IETF's history and role in the Internet today is described in Kessler [15]. For information on the organizations involved in the IETF standards process, see RFC 2028 [11]. For information on the relationship between the IETF and ISOC, see RFC 2031 [12]. 9.1. Request for Comments (RFCs) RFCs are the body of literature comprising Internet protocols, standards, research questions, hot topics, humor (especially those dated 1 April), and general information. Each RFC is uniquely issued Kessler & Shepard Informational [Page 41] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 a number which is never reused or reissued; if a document is revised, it is given a new RFC number and the old RFC is said to be obsoleted. Announcements are sent to the RFC-DIST mailing list whenever a new RFC is issued; anyone may join this list by sending e-mail to majordomo@zephyr.isi.edu with the line "subscribe rfc-dist" in the body of the message. RFCs may be obtained through the mail (i.e., postal service), but it is easier and faster to get them on-line. One easy way to obtain RFCs on-line is to use RFC-INFO, an e-mail-based service to help users locate and retrieve RFCs and other Internet documents. To use the service, send e-mail to rfc-info@isi.edu and leave the Subject: field blank; commands that may go in the main body of the message include: help (Help file) help: ways_to_get_rfcs (Help file on how to get RFCs) RETRIEVE: RFC Doc-ID: RFCxxxx (Retrieve RFC xxxx; use all 4 digits) LIST: RFC (List all RFCs…) [options] (…[matching the following options]) KEYWORDS: xxx (Title contains string "xxx") AUTHOR: xxx (Written by "xxx") ORGANIZATION: xxx (Issued by company "xxx") DATED-AFTER: mmm-dd-yyyy DATED-BEFORE: mmm-dd-yyyy OBSOLETES: RFCxxxx (List RFCs obsoleting RFC xxxx) Another RFC e-mail server can be found at the InterNIC. To use this service, send an e-mail message to mailserv@ds.internic.net, leaving the Subject: field blank. In the main body of the message, use one or more of the following commands: help (Help file) file /ftp/rfc/rfcNNNN.txt (Text version of RFC NNNN) file /ftp/rfc/rfcNNNN.ps (Postscript version of RFC NNNN) document-by-name rfcNNNN (Text version of RFC NNNN) Kessler & Shepard Informational [Page 42] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 ——————————————————————- TABLE 1. Primary RFC Repositories. HOST ADDRESS DIRECTORY ds.internic.net rfc nis.nsf.net internet/documents/rfc nisc.jvnc.net rfc ftp.isi.edu in-notes wuarchive.wustl.edu info/rfc src.doc.ic.ac.uk rfc ftp.ncren.net rfc ftp.sesqui.net pub/rfc nis.garr.it mirrors/RFC funet.fi rfc munnari.oz.au rfc ——————————————————————- To obtain an RFC via anonymous FTP, connect to one of the RFC repositories listed in Table 1 using FTP. After connecting, change to the appropriate RFC directory (as shown in Table 1) using the cd command. To obtain a particular file, use the get command: GET RFC-INDEX.TXT local_name (RFC Index) GET RFCxxxx.TXT local_name (Text version of RFC xxxx) GET RFCxxxx.PS local_name (Postscript version of RFC xxxx) The RFC index, or a specific reference to an RFC, will indicate whether the RFC is available in ASCII text (.txt) or Postscript (.ps) format. By convention, all RFCs are available in ASCII while some are also available in Postscript where use of graphics and/or different fonts adds more information or clarity; an increasing number are also being converted to HTML. Be aware that the index file is very large, containing the citing for over 2,000 documents. Note that not all RFCs numbered below 698 (July 1975) are available on-line. Finally, the InterNIC's Web site at http://ds.internic.net/ds/dspg1intdoc.html contains the RFC index and a complete set of RFCs. More information about Web-based RFC servers can be found at http://www.isi.edu/rfc-editor/rfc-sources.html. The sample dialogue below, although highly abbreviated, shows a user obtaining RFC 1594 (Answers to Commonly asked "New Internet User" Questions) using e-mail and anonymous FTP. Kessler & Shepard Informational [Page 43] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997 ==================================================================== SMCVAX$ mail MAIL> send To: in%"rfc-info@isi.edu"

Subject:
Enter your message below. Press CTRL/Z when complete, CTRL/C to quit

retrieve: rfc doc-id: rfc1594 ^Z MAIL> exit

SMCVAX$ ftp ds.internic.net Username: anonymous Password: NIC.DDN.MIL> cd rfc NIC.DDN.MIL> get rfc1594.txt rfc-1594.txt NIC.DDN.MIL> exit

SMCVAX$
====================================================================

9.2. Internet Standards

 RFCs describe many aspects of the Internet. By the early 1990s,
 however, so many specifications of various protocols had been written
 that it was not always clear as to which documents represented
 standards for the Internet. For that reason, a subset of RFCs have
 been designated as STDs to identify them as Internet standards.
 Unlike RFC numbers that are never reused, STD numbers always refer to
 the latest version of the standard. UDP, for example, would be
 completely identified as "STD-6/RFC-768."  Note that STD numbers
 refer to a standard, which is not necessarily a single document; STD
 19, for example, is the NetBIOS Service Protocols standard comprising
 RFCs 1001 and 1002, and a complete citation for this standard would
 be "STD-19/RFC-001/RFC-1002."
 The availability of new STDs is announced on the RFC-DIST mailing
 list.  STD-1 [23] always refers to the latest list of "Internet
 Official Protocol Standards". The Internet standards process is
 described in RFC 2026 [5] and STD notes are explained in RFC 1311
 [24].
 STDs can be obtained as RFCs via anonymous FTP from any RFC
 repository.  In addition, some RFC sites (such as ds.internic.net)
 provide an STD directory so that STD documents can be found in the
 path /STD/xx.TXT, where xx refers to the STD number.

Kessler & Shepard Informational [Page 44] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 STD documents may be obtained as RFCs using the methods described in
 Section 9.1. STDs may also be obtained via the RFC-INFO server using
 the RETRIEVE: STD  and Doc-ID: STDxxxx commands. Also, check out the
 InterNIC's Web site at http://www.internic.net/std/ for the STD index
 and a complete set of STDs.

9.3. For Your Information Documents

 The For Your Information (FYI) series of RFCs provides Internet users
 with information about many topics related to the Internet. FYI
 topics range from historical to explanatory to tutorial, and are
 aimed at the wide spectrum of people that use the Internet. The FYI
 series includes answers to frequently asked questions by both
 beginning and seasoned users of the Internet, an annotated
 bibliography of Internet books, and an explanation of the domain name
 system.
 Like the STDs, an FYI number always refers to the latest version of
 an FYI. FYI 4, for example, refers to the answers to commonly asked
 questions by new Internet users; its complete citation would be
 "FYI-4/RFC-1594."  The FYI notes are explained in FYI 1 [18].
 FYIs can be obtained as RFCs via anonymous FTP from any RFC
 repository.  In addition, some RFC sites (such as ds.internic.net)
 provide an FYI directory so that FYI documents can be found in the
 path /FYI/xx.TXT, where xx refers to the FYI number.
 FYI documents may be obtained as RFCs using the methods described in
 Section 9.1. FYIs may also be obtained via the RFC-INFO server using
 the RETRIEVE: FYI and Doc-ID: FYIxxxx commands. Also, check out the
 InterNIC's Web site at http://www.internic.net/fyi/ for the FYI index
 and a complete set of FYIs.

9.4. Best Current Practices

 Standards track RFCs are formally part of the IETF standards process,
 subject to peer review, and intended to culminate in an official
 Internet Standard. Other RFCs are published on a less formal basis
 and are not part of the IETF process. To provide a mechanism of
 publishing relevant technical information which it endorsed, the IETF
 created a new series of RFCs, called the Best Current Practices (BCP)
 series. BCP topics include variances from the Internet standards
 process and IP address allocation in private networks.

Kessler & Shepard Informational [Page 45] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 Like the STDs and FYIs, a BCP number always refers to the latest
 version of a BCP. BCP 5, for example, describes an IP address
 allocation plan for private networks; its complete citation would be
 "BCP-5/RFC-1918."  The BCP process is explained in BCP 1 [25].
 BCP documents may be obtained as RFCs using the methods described in
 Section 9.1. BCPs may also be obtained via the RFC-INFO server using
 the RETRIEVE: BCP and Doc-ID: BCPxxxx commands. Also, check out the
 RFC Editor's Web site at http://www.isi.edu/rfc-editor/ for the BCP
 index and a complete set of BCPs.

9.5. RARE Technical Reports

 RARE, the Reseaux Associes pour la Recherche Europeenne (Association
 of European Research Networks), has a charter to promote and
 participate in the creation of a high-quality European computer
 communications infrastructure for the support of research endeavors.
 RARE member networks use Open Systems Interconnection (OSI) protocols
 and TCP/IP. To promote a closer relationship between RARE and the
 IETF, RARE Technical Reports (RTRs) have also been published as RFCs
 since the summer of 1993.
 RTR documents may be obtained as RFCs using the methods described in
 Section 9.1. RTRs may also be obtained via the RFC-INFO server using
 the RETRIEVE: RTR  and Doc-ID: RTRxxxx commands. Also, check out the
 InterNIC's Web site at http://www.internic.net/rtr/ for the RTR index
 and a complete set of RTRs. Finally, RTRs may be obtained via
 anonymous FTP from ftp://ftp.rare.nl/rare/publications/rtr/.

10. Perusing the Internet

 This guide is intended to provide the reader with a rudimentary
 ability to use the utilities that are provided by TCP/IP and the
 Internet. By now, it is clear that the user's knowledge, ability, and
 willingness to experiment are about the only limits to what can be
 accomplished.
 There are several books that will help you get started finding sites
 on the Internet, including The INTERNET Yellow Pages [9]. But much
 more timely and up-to-date information can be found on the Internet
 itself, using such search tools as Yahoo! (http://www.yahoo.com),
 Excite (http://www.excite.com), Lycos (http://www.lycos.com),
 WebCrawler (http://www.webcrawler.com), and AltaAvista
 (http://altavista.digital.com).

Kessler & Shepard Informational [Page 46] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 There are several other sources that cite locations from which to
 access specific information about a wide range of subjects using such
 tools as FTP, Telnet, Gopher, and WWW. One of the best periodic
 lists, and archives, is through the Scout Report, a weekly
 publication by the InterNIC's Net Scout Services Project at the
 University of Wisconsin's Computer Science Department. To receive the
 Scout Report by e-mail each week, join the mailing list by sending
 email to listserv@lists.internic.net; place the line subscribe
 scout-report your_full_name in the body of the message to receive the
 text version or use subscribe scout-report-html your_full_name to
 receive the report in HTML. The Scout Report is also available on the
 Web at http://www.cs.wisc.edu/scout/report and
 http://rs.internic.net/scout/report, or via anonymous FTP at
 ftp://rs.internic.net/scout/.
 Another list is Yanoff's Internet Services List, which may be found
 at http://www.spectracom.com/islist/ or
 ftp://ftp.csd.uwm.edu/pub/inet.services.txt. Gary Kessler, one of the
 co-author's of this document, maintains his own eclectic
 Miscellaneous Sites List at
 http://www.together.net/~kessler/gck_site.html.
 If you are looking for Internet-specific information, one good
 starting point is
 http://www.yahoo.com/Computers_and_Internet/Internet/. The InterNIC
 is another valuable resource, with their Scout Report and Scout
 Toolkit (http://rs.internic.net/scout/toolkit).
 There is also a fair amount of rudimentary tutorial information
 available on the Internet. The InterNIC cosponsors "The 15 Minute
 Series" (http://rs.internic.net/nic-support/15min/), a collection of
 free, modular, and extensible training materials on specific Internet
 topics. ROADMAP96 (http://www.ua.edu/~crispen/roadmap.html) is a
 free, 27-lesson Internet training workshop over e-mail.
 More books and specialized articles came out about the Internet in
 1993 and 1994 than in all previous years (squared!), and that trend
 has seemed to continue into 1995, 1996, and beyond. Three books are
 worth notable mention because they do not directly relate to finding
 your way around, or finding things on, the Internet. Hafner and Lyon
 [8] have written Where Wizards Stay Up Late: The Origins of the
 Internet, a history of the development of the Advanced Research
 Projects Agency (ARPA), packet switching, and the ARPANET, focusing
 primarily on the 1960s and 1970s. While culminating with the
 APRANET's 25th Anniversary in 1994, its main thrusts are on the
 groups building the ARPANET backbone (largely BBN) and the host-to-
 host application and communication protocols (largely the Network
 Working Group). Salus' book, Casting The Net: From ARPANET to

Kessler & Shepard Informational [Page 47] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 INTERNET and beyond... [28], goes into the development of the network
 from the perspective of the people, protocols, applications, and
 networks. Including a set of "diversions," his book is a bit more
 whimsical than Hafner & Lyon's. Finally, Carl Malamud has written a
 delightful book called Exploring the Internet: A Technical Travelogue
 [17], chronicling not the history of the Internet as much as a subset
 of the people currently active in building and defining  it. This
 book will not teach you how to perform an anonymous FTP file transfer
 nor how to use Gopher, but provides insights about our network (and
 Carl's gastro-pathology) that no mere statistics can convey.

11. Acronyms and Abbreviations

 ASCII     American Standard Code for Information Interchange
 BCP       Best Current Practices
 BITNET    Because It's Time Network
 DDN       Defense Data Network
 DNS       Domain Name System
 EARN      European Academic Research Network
 FAQ       Frequently Asked Questions list
 FTP       File Transfer Protocol
 FYI       For Your Information series of RFCs
 HTML      Hypertext Markup Language
 HTTP      Hypertext Transport Protocol
 ICMP      Internet Control Message Protocol
 IP        Internet Protocol
 ISO       International Organization for Standardization
 NetBIOS   Network Basic Input/Output System
 NIC       Network Information Center
 NICNAME   Network Information Center name service
 NSF       National Science Foundation
 NSFNET    National Science Foundation Network
 RFC       Request For Comments
 RARE      Reseaux Associes pour la Recherche Europeenne
 RTR       RARE Technical Reports
 STD       Internet Standards series of RFCs
 TCP       Transmission Control Protocol
 TTL       Time-To-Live
 UDP       User Datagram Protocol
 URL       Uniform Resource Locator
 WAIS      Wide Area Information Server
 WWW       World Wide Web

Kessler & Shepard Informational [Page 48] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

12. Security Considerations

 Security issues are not discussed in this memo.

13. Acknowledgments

 Our thanks are given to all sites that we accessed or otherwise used
 system resources in preparation for this document. We also appreciate
 the comments and suggestions from our students and members of the
 Internet community, particularly after the last version of this
 document was circulated, including Mark Delany and the rest of the
 gang at the Australian Public Access Network Association, Margaret
 Hall (BBN), John Martin (RARE), Tom Maufer (3Com), Carol Monaghan
 (Hill Associates), Michael Patton (BBN), N. Todd Pritsky (Hill
 Associates), and Brian Williams. Special thanks are due to Joyce
 Reynolds for her continued encouragement and direction.

14. References

[1] Anklesaria, F., M. McCahill, P. Lindner, D. Johnson, D. Torrey,

   and B. Alberti, "The Internet Gopher Protocol," RFC 1436,
   University of Minnesota, March 1993.

[2] Berners-Lee, T. and D. Connolly, "Hypertext Markup Language - 2.0,"

   RFC 1866, MIT/W3C, November 1995.

[3] _, R. Fielding, and H. Frystyk, "Hypertext Transfer Protocol -

   HTTP/1.0," RFC 1945, MIT/LCS, UC Irvine, MIT/LCS, May 1996.

[4] _, L. Masinter, and M. McCahill, Editors, "Uniform Resource

   Locators (URL)," RFC 1738, CERN, Xerox Corp., University of
   Minnesota, December 1994.

[5] Bradner, S. "The Internet Standards Process – Revision 3," RFC

   2026, Harvard University, October 1996.

[6] Comer, D. Internetworking with TCP/IP, Vol. I: Principles,

   Protocols, and Architecture, 3/e. Englewood Cliffs (NJ): Prentice-
   Hall, 1995.

[7] Feit, S. TCP/IP: Architecture, Protocols, and Implementation with

   IPv6 and IP Security, 2/e. New York: McGraw-Hill, 1997.

[8] Hafner, K. and M. Lyon. Where Wizards Stay Up Late: The Origins

   of the Internet. New York: Simon & Schuster, 1997.

Kessler & Shepard Informational [Page 49] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

[9] Hahn, H. and R. Stout. The Internet Yellow Pages, 3/e. Berkeley

   (CA): Osborne McGraw-Hill, 1996.

[10] Harrenstien, K., M. Stahl, and E. Feinler, "NICNAME/WHOIS,"

   RFC 954, SRI, October 1985.

[11] Hovey, R. and S. Bradner. "The Organizations Involved in the IETF

   Standards Process," RFC 2028, Digital, Harvard University, October
   1996.

[12] Huizer, E. "IETF-ISOC Relationship," RFC 2031, SEC, October 1996.

[13] Kantor, B. and P. Lapsley. "Network News Transfer Protocol," RFC

   977, U.C. San Diego, U.C. Berkeley, February 1986.

[14] Kessler, G.C. "An Overview of TCP/IP Protocols and the Internet."

   URL: http://www.hill.com/library/tcpip.html. Last accessed: 17
   February 1997

[15] _. "IETF-History, Background, and Role in Today's Internet."

   URL: http://www.hill.com/library/ietf_hx.html. Last accessed: 17
   February 1997.

[16] _. "Running Your Own DNS." Network VAR, July 1996. (See also

   URL: http://www.hill.com/library/dns.html. Last accessed: 17
   February 1997.)

[17] Malamud, C. Exploring the Internet: A Technical Travelogue.

   Englewood Cliffs (NJ): PTR Prentice Hall, 1992.

[18] Malkin, G.S. and J.K. Reynolds, "F.Y.I. on F.Y.I.: Introduction to

   the F.Y.I. notes," FYI 1/RFC 1150, Proteon, USC/Information
   Sciences Institute, March 1990.

[19] Mockapetris, P., "Domain Names - Concepts and Facilities,"

   STD 13/RFC 1034, USC/Information Sciences Institute, November 1987.

[20] National Center for Supercomputer Applications (NCSA). "A

   Beginner's Guide to HTML." URL:
   http://www.ncsa.uiuc.edu/General/Internet/WWW/HTMLPrimer.html. Last
   accessed: 2 February 1997.

[21] Postel, J., "Domain Name System Structure and Delegation,"

   USC/Information Sciences Institute, RFC 1591, March 1994.

[22] _, "Internet Control Message Protocol," USC/Information

   Sciences Institute, RFC 792, September 1981.

Kessler & Shepard Informational [Page 50] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

[23] _, Editor, "Internet Official Protocol Standards,"

   STD 1/RFC 2000, Internet Architecture Board, February 1997.

[24] _, "Introduction to the STD Notes," RFC 1311, USC/Information

   Sciences Institute, March 1992.

[25] _, T. Li, and Y. Rekhter, "Best Current Practices," BCP 1/RFC

   1818, USC/Information Sciences Institute, Cisco Systems, August
   1995.

[26] _ and J. Reynolds, "File Transfer Protocol (FTP),"

   STD 9/RFC 959, USC/Information Sciences Institute, October 1985.

[27] _ and J. Reynolds, "TELNET Protocol Specification,"

   STD 8/RFC 854, USC/Information Sciences Institute, May 1983.

[28] Salus, P.H. Casting The Net: From ARPANET to INTERNET and beyond…

   Reading (MA): Addison-Wesley, 1995.

[29] Socolofsky, T.J. and C.J. Kale, "TCP/IP Tutorial," RFC 1180, Spider

   Systems Ltd., January 1991.

[30] Stevens, W.R. TCP/IP Illustrated, Volume 1: The Protocols. Reading

   (MA): Addison-Wesley, 1994.

[31] Williamson, S., "Transition and Modernization of the Internet

   Registration Service," RFC 1400, Network Solutions, Inc., March
   1993.

[32] Zimmerman, D., "The Finger User Information Protocol," RFC 1288,

   Rutgers University, December 1991.

15. Authors' Address

 Gary C. Kessler
 Hill Associates
 17 Roosevelt Highway
 Colchester, VT  05446
 Phone:  +1 802-655-8659
 Fax:  +1 802-655-7974
 E-mail: kumquat@hill.com

Kessler & Shepard Informational [Page 51] RFC 2151 Internet & TCP/IP Tools & Utilities June 1997

 Steven D. Shepard
 Hill Associates
 17 Roosevelt Highway
 Colchester, VT  05446
 Phone:  +1 802-655-8646
 Fax:  +1 802-655-7974
 E-mail: s.shepard@hill.com

Kessler & Shepard Informational [Page 52]

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