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rfc:rfc208

Network Working Group A. McKenzie Request for Comments: 208 Bolt Beranek and Newman NIC: 7181 9 August 1971 Categories: B.l, C.2 Updates: none Obsoletes: none

                           ADDRESS TABLES
 Attached is a copy of a revision to Appendix A of BBN Report No.
 1822; the revised version of the Appendix is our first attempt to
 make the list of sites attached to the ARPA Network prospective
 rather than retrospective.  We are adopting this approach because of
 the large number of sites scheduled for attachment in the near
 future, and because many Hosts apparently require a site's address to
 be in some local table before their NCPs will permit communication
 with the site.  Therefore, we urge such Hosts to add the new sites to
 their lists of addresses as soon as possible.  Also, please note the
 address change which will be made at BBN on exactly September first.
 Incidentally, it seems to us that it is irrational for an NCP to
 discard otherwise valid messages, simply because the sender's address
 doesn't appear in a local table.  Similarly, it seems almost as
 irrational for an NCP to prevent a local user from trying to
 communicate with a remote site, the address of which is known to the
 user but not stored in the NCP's tables.

McKenzie [Page 1] RFC 208 Address Tables 9 August 1971

Report No. 1822 Bolt Beranek and Newman Inc.

APPENDIX A

IMP AND HOST SITE IDENTIFICATION

 Bit 9-16 of the leader of most Host-to-IMP or IMP-to-Host messages
 define a network address related to the message (these bits are not
 meaningful for message types 1, 2, and 4).  In a Host-to-IMP message
 the network address identifies a particular Host to which the message
 should be delivered.  In an IMP-to-Host message the network address
 identifies the Host from which the message originated.
 A network address consists of six bits (bits 11-16 of the leader)
 which specify an IMP number, preceded by two bits (bits 9-10 of the
 leader) which specify the Host number of a particular Host connected
 to that IMP.  The table below gives the decimal values of IMP number,
 Host number, and network address for each Host currently connected to
 the ARPA Network or scheduled for connection in the near future.
 Scheduled installation dates are also shown for Hosts not currently
 connected; these dates, however, are subject to change without
 notice.
  IMP      SITE     HOST                    NETWORK    SCHEDULED
 NUMBER    NAME    NUMBER       HOST        ADDRESS   INSTALLATION
 ------    ----    ------       ----        -------   ------------
   1       UCLA      0       SIGMA-7           1
                     1       IBM 360/91       65
   2       SRI       0       PDP-10 (NIC)      2
                     1       PDP-10 (Al)      66
   3       UCSB      0       IBM 360/75        3
   4       UTAH      0       PDP-lO            4
   5       BBN       0       DDP-516           5  )   See Note 1
                     1       PDP-10 (A)       69  )
                     2       PDP-1O (B)      133
 Note 1: Prior to September 1, 1971 the BBN PDP-1O (A) will be Host
 number 0 (network address 5) and the BBN DDP-516 will be Host number
 1 (network address 69).  The address change is to be made during the
 day on 9/1/71.

McKenzie [Page 2] RFC 208 Address Tables 9 August 1971

IMP SITE HOST NETWORK SCHEDULE NUMBER NAME NUMBER HOST ADDRESS INSTALLATION —— —- —— —- ——- ————

6        MIT          0       Honeywell 645        6
                      1       PDP-10              70
7        RAND         O       360/65               7
                      1       PDP-1O              71
8        SDC          O       IBM 360/75           8
9        HARVARD      O       PDP-1O               9
                      1       PDP-1               73
                      2       PDP-11             137

10 LINCOLN O IBM 360/67 10

                      1       TX2                 74

11 STANFORD O PDP-1O 11 12 ILLINOIS O PDP-11 12 13 CASE O PDP-1O 13 14 CARNEGIE O PDP-1O 14 15 PAOLI O B6500 15 16 NASA/AMES O IBM 360/67 16 8/3/71

                      2       TIP                144

17 MITRE 2 TIP 145 8/31/71 18 RADC O H 635/645 18 10/5/71

                      2       TIP                146

19 NBS O PDP-11 19 11/2/71 20 ETAC 2 TIP 148 11/30/71 21 TINKER O 418 III 21 1/4/71 22 McCLELLAN O 418 III 22 2/1/72 23 USC 0 IBM 360/44 23 2/29/72

                      2       TIP                151

24 GWC 2 TIP 152 3/14/72 25 NCAR O CDC 7600 25 3/28/72

                      2       TIP                153

30 BBN/TIP 2 TIP 158

McKenzie [Page 3]

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