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rfc:rfc7553

Internet Engineering Task Force (IETF) P. Faltstrom Request for Comments: 7553 Netnod Category: Informational O. Kolkman ISSN: 2070-1721 ISOC

                                                             June 2015
     The Uniform Resource Identifier (URI) DNS Resource Record

Abstract

 This document describes the already registered DNS resource record
 (RR) type, called the Uniform Resource Identifier (URI) RR, that is
 used for publishing mappings from hostnames to URIs.

Status of This Memo

 This document is not an Internet Standards Track specification; it is
 published for informational purposes.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Not all documents
 approved by the IESG are a candidate for any level of Internet
 Standard; see Section 2 of RFC 5741.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc7553.

Copyright Notice

 Copyright (c) 2015 IETF Trust and the persons identified as the
 document authors.  All rights reserved.
 This document is subject to BCP 78 and the IETF Trust's Legal
 Provisions Relating to IETF Documents
 (http://trustee.ietf.org/license-info) in effect on the date of
 publication of this document.  Please review these documents
 carefully, as they describe your rights and restrictions with respect
 to this document.  Code Components extracted from this document must
 include Simplified BSD License text as described in Section 4.e of
 the Trust Legal Provisions and are provided without warranty as
 described in the Simplified BSD License.

Faltstrom & Kolkman Informational [Page 1] RFC 7553 URI Resource Record June 2015

Table of Contents

 1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
 2.  Applicability Statement . . . . . . . . . . . . . . . . . . .   3
 3.  DNS Considerations  . . . . . . . . . . . . . . . . . . . . .   4
 4.  The Format of the URI RR  . . . . . . . . . . . . . . . . . .   4
   4.1.  Owner Name, Class, and Type . . . . . . . . . . . . . . .   4
   4.2.  Priority  . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.3.  Weight  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.4.  Target  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.5.  URI RDATA Wire Format . . . . . . . . . . . . . . . . . .   6
 5.  Usages  . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.1.  Example: FTP Server in the example.com Domain . . . . . .   6
   5.2.  Relation to S-NAPTR . . . . . . . . . . . . . . . . . . .   7
   5.3.  Relation to U-NAPTR . . . . . . . . . . . . . . . . . . .   7
   5.4.  Relation to SRV . . . . . . . . . . . . . . . . . . . . .   7
 6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.1.  Registration of the URI Resource Record Type  . . . . . .   7
   6.2.  Registration of Services  . . . . . . . . . . . . . . . .   8
 7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
 8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
   8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
   8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
 Appendix A.  The Original RRTYPE Allocation Request . . . . . . .  11
 Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  14
 Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

Faltstrom & Kolkman Informational [Page 2] RFC 7553 URI Resource Record June 2015

1. Introduction

 This document explains the use of the Domain Name System (DNS) for
 the storage of URIs [RFC3986] and how to resolve hostnames to such
 URIs that can be used by various applications using the URI resource
 record type.  For resolution, the application needs to know both the
 hostname and the protocol that the URI is to be used for.  The
 protocol is registered by IANA.
 Historically, uses of the DNS to map a domain name to a URL have
 relied on the Naming Authority Pointer (NAPTR) RRTYPEs [RFC2915] and
 then on the Dynamic Delegation Discovery System (DDDS) [RFC3401]
 application framework with the DNS as a database as specified in RFC
 3404 [RFC3404].  This has a number of implications such as the fact
 the RRSet returned will contain all URIs "connected" with the owner,
 and not only the ones related to a specific service.
 The URI resource record specified in this document enables the
 querying party to do the equivalent of selecting which of the NAPTR
 records one is interested in and have only those returned.  This is
 possible because data in the service field of the NAPTR record is
 included in the owner part of the URI resource record type.  It is
 also the case that as the URI resource record type includes the
 target URI directly as part of the RDATA, it is very easy to extract
 the correct target URI, instead of applying rewrite rules as in
 NAPTR.
 Querying for URI resource records is not replacing querying for NAPTR
 resource records (or use of S-NAPTR [RFC3958]).  Instead, the URI
 resource record type provides a complementary mechanism to be used
 when one already knows what service field is interesting.  With it,
 one can directly query for the specific subset of the otherwise
 possibly large RRSet returned when querying for NAPTR resource
 records.
 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
 document are to be interpreted as described in BCP 14, RFC 2119
 [RFC2119].

2. Applicability Statement

 In general, it is expected that URI records will be used by clients
 for applications where the relevant protocol to be used is known,
 but, for example, an extra abstraction is needed in order to separate
 a domain name from a point of service (as addressed by the URI).  One
 example of such a situation is when an organization has many domain
 names but only one official web page.

Faltstrom & Kolkman Informational [Page 3] RFC 7553 URI Resource Record June 2015

 Applications need to know the specific service to prepend the
 hostname with.  Using repetitive queries for URI records is not a
 replacement for querying for NAPTR records according to the NAPTR
 (DDDS) or S-NAPTR algorithms.  NAPTR records serve the purpose of
 discovering the various services or the URIs (for looking up access
 points for a given service).  These are two very different kinds of
 needs.

3. DNS Considerations

 Using prefix labels, such as underscored service tags, for a specific
 owner name may cause a counter-intuitive effect when the owner name
 is a wildcard name.  For example, _s2._s1.*.example.net is not a
 wildcard name and cannot be used to return a synthesized answer for a
 query name of _s2._s1.a.example.net.  See Section 4.5 of RFC 4592
 [RFC4592] for more details.  Besides, underscored service tags used
 for the URI RR (based on the "Service Name and Transport Protocol
 Port Number Registry") may have slightly different semantics than
 service tags used for underscored prefix labels that are used in
 combination with other (yet unspecified) RR types.  This may cause
 subtle management problems when delegation structure that has
 developed within the context of URI RRs is also to be used for other
 RR types.  Because the service labels might be overloaded,
 applications should carefully check that the application-level
 protocol is indeed the protocol they expect.
 Subtle management issues may also arise when the delegations from
 service to sub-service labels involve several parties and different
 stakeholders.

4. The Format of the URI RR

 This is the presentation format of the URI RR:
    Owner name TTL Class URI Priority Weight Target
 The URI RR does not cause any kind of Additional Section processing.

4.1. Owner Name, Class, and Type

 The URI owner name is subject to special conventions.
 Just like the SRV RR [RFC2782], the URI RR has service information
 encoded in its owner name.  In order to encode the service for a
 specific owner name, one uses service parameters.  Valid service
 parameters are those registered by IANA in the "Service Name and
 Transport Protocol Port Number Registry" [RFC6335] or as "Enumservice

Faltstrom & Kolkman Informational [Page 4] RFC 7553 URI Resource Record June 2015

 Registrations [RFC6117].  The Enumservice Registration parameters are
 reversed (i.e., subtype(s) before type), prepended with an underscore
 (_), and prepended to the owner name in separate labels.  The
 underscore is prepended to the service parameters to avoid collisions
 with DNS labels that occur in nature, and the order is reversed to
 make it possible to do delegations, if needed, to different zones
 (and therefore providers of DNS).
 For example, suppose we are looking for the URI for a service with
 ENUM Service Parameter "A:B:C" for host example.com.  Then we would
 query for (QNAME,QTYPE)=("_C._B._A.example.com","URI").
 As another example, suppose we are looking for the URI for a service
 with Service Name "A" and Transport Protocol "B" for host
 example.com.  Then we would query for
 (QNAME,QTYPE)=("_A._B.example.com","URI").
 The type number for the URI record is 256.
 The URI resource record is class independent.
 The URI RR has no special Time-to-Live (TTL) requirements.

4.2. Priority

 This field holds the priority of the target URI in this RR.  Its
 range is 0-65535.  A client MUST attempt to contact the URI with the
 lowest-numbered priority it can reach; URIs with the same priority
 SHOULD be selected according to probabilities defined by the weight
 field.

4.3. Weight

 This field holds the server selection mechanism.  The weight field
 specifies a relative weight for entries with the same priority.
 Larger weights SHOULD be given a proportionately higher probability
 of being selected.  The range of this number is 0-65535.

4.4. Target

 This field holds the URI of the target, enclosed in double-quote
 characters ('"'), where the URI is as specified in RFC 3986
 [RFC3986].  Resolution of the URI is according to the definitions for
 the Scheme of the URI.

Faltstrom & Kolkman Informational [Page 5] RFC 7553 URI Resource Record June 2015

 Since the URI will not be encoded as a <character-string> (see
 Section 3.3 of RFC 1035 [RFC1035]), there is no 255-character size
 limitation.
 The Target MUST NOT be an empty URI ("").

4.5. URI RDATA Wire Format

 The RDATA for a URI RR consists of a 2-octet Priority field, a
 2-octet Weight field, and a variable-length Target field.
 Priority and Weight are unsigned integers in network byte order.
 The remaining data in the RDATA contains the Target field.  The
 Target field contains the URI as a sequence of octets (without the
 enclosing double-quote characters used in the presentation format).
 The length of the Target field MUST be greater than zero.
                      1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |          Priority             |          Weight               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 /                                                               /
 /                             Target                            /
 /                                                               /
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

5. Usages

5.1. Example: FTP Server in the example.com Domain

 An organization has the domain names example.com and example.net, and
 their FTP archive is at ftp://ftp1.example.com/public.  Given the
 service name "ftp" and transport protocol "tcp" (from the IANA
 "Service Name and Transport Protocol Port Number Registry"), the
 following URI resource records could be made available in the
 respective zones (example.com and example.net):
 $ORIGIN example.com.
 _ftp._tcp    IN URI 10 1 "ftp://ftp1.example.com/public"
 $ORIGIN example.net.
 _ftp._tcp    IN URI 10 1 "ftp://ftp1.example.com/public"

Faltstrom & Kolkman Informational [Page 6] RFC 7553 URI Resource Record June 2015

5.2. Relation to S-NAPTR

 The URI resource record type is not a replacement for the S-NAPTR.
 It is instead an extension and the second step of the S-NAPTR
 resolution can resolve a URI resource record instead of using SRV
 records and yet another algorithm for how to use SRV records for the
 specific protocol.
 $ORIGIN example.com.
 ;;                  order pref flags
            IN NAPTR 100   10   "D"   "EM:ProtA"  ( ; service
                     ""                             ; regexp
                     _http._tcp.example.com. )      ; replacement
 _http._tcp IN URI   10 1 "http://www.example.com/path"

5.3. Relation to U-NAPTR

 The URI resource record type, together with S-NAPTR, can be viewed as
 a replacement for U-NAPTR [RFC4848].  The URI resource record type is
 only interesting when one know a base domain name, a protocol, and a
 service so that one can compose the record to look up.  NAPTR records
 of any kind are used to look up what services exist for a certain
 domain, which is one step before the URI resource record is used.

5.4. Relation to SRV

 The URI resource record type can be viewed as a replacement for the
 SRV record.  This is because it, like the SRV record, can only be
 looked up if one knows the base domain, the protocol, and the
 service.  It has a similar functionality and uses the same registry
 for service names, but instead of returning a hostname and port
 number, the URI record returns a full URI.  As such, it can be viewed
 as a more powerful resource record than SRV.

6. IANA Considerations

6.1. Registration of the URI Resource Record Type

 After an expert review in February 2011 (see Appendix A), IANA
 allocated RRTYPE 256 for the URI resource record type in the registry
 named "Resource Record (RR) TYPEs" (as defined in [BCP42], which was
 RFC 6195 at the time but has since been replaced by RFC 6895) located
 at <http://www.iana.org/assignments/dns-parameters>.
 IANA has updated the reference for this registration to refer to this
 RFC.

Faltstrom & Kolkman Informational [Page 7] RFC 7553 URI Resource Record June 2015

6.2. Registration of Services

 No new registry is needed for the registration of services as the
 Service Name, Transport Protocol Port Numbers, Enumservices and the
 DNS SRV Service Type registries are also used for the URI resource
 record type.

7. Security Considerations

 Using the URI resource record together with security mechanisms that
 rely on verification of authentication of hostnames, like TLS, makes
 it important to choose the correct domain name when doing the
 comparison and ensure that the change in the hostname to be used is
 secured by DNSSEC so that it can be trusted in a similar way as a
 redirect in HTTP using TLS.
 If, for example, the URI resource record is not signed with the help
 of DNSSEC and then validated successfully, trusting the non-signed
 URI will effectively lead to a downgrade attack.
 The basic mechanism for successful use of URI works as follows:
 1.   Announce that example.com is hosted at example.org (with some
      URL) in DNS.
 2.   Secure the URI resource record with DNSSEC.  This is best done
      by doing validation in the application doing the lookup, but it
      could also be done in the local recursive resolver or in the
      trusted recursive resolver also doing validation.  All are
      according to the local trust policy.
 3.   Verify the TLS (for example) certificate for the connection to
      example.org matches, i.e., use the hostname in the URI and not
      the hostname used originally when looking up the URI resource
      record.
 4.   If needed, do application-layer authentication, etc., over the
      then encrypted connection.
 It is also possible that the URI in the resource record type has
 errors in it.  Applications using the URI resource record type for
 resolution should behave similarly as if the user typed (or copied
 and pasted) the URI.  At least it must be clear to the user that the
 error is not due to any error from his side.

Faltstrom & Kolkman Informational [Page 8] RFC 7553 URI Resource Record June 2015

 One SHOULD NOT include userinfo (see "User Information",
 Section 3.2.1 of RFC 3986 [RFC3986]) in a URI that is used in a URI
 resource record as DNS data must be viewed as publicly available
 information.

8. References

8.1. Normative References

 [BCP42]    Eastlake 3rd, D., "Domain Name System (DNS) IANA
            Considerations", BCP 42, RFC 6895, April 2013,
            <http://www.rfc-editor.org/info/bcp42>.
 [RFC1035]  Mockapetris, P., "Domain names - implementation and
            specification", STD 13, RFC 1035, DOI 10.17487/RFC1035,
            November 1987, <http://www.rfc-editor.org/info/rfc1035>.
 [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
            Requirement Levels", BCP 14, RFC 2119,
            DOI 10.17487/RFC2119, March 1997,
            <http://www.rfc-editor.org/info/rfc2119>.
 [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
            Resource Identifier (URI): Generic Syntax", STD 66,
            RFC 3986, DOI 10.17487/RFC3986, January 2005,
            <http://www.rfc-editor.org/info/rfc3986>.
 [RFC6117]  Hoeneisen, B., Mayrhofer, A., and J. Livingood, "IANA
            Registration of Enumservices: Guide, Template, and IANA
            Considerations", RFC 6117, DOI 10.17487/RFC6117, March
            2011, <http://www.rfc-editor.org/info/rfc6117>.
 [RFC6335]  Cotton, M., Eggert, L., Touch, J., Westerlund, M., and S.
            Cheshire, "Internet Assigned Numbers Authority (IANA)
            Procedures for the Management of the Service Name and
            Transport Protocol Port Number Registry", BCP 165,
            RFC 6335, DOI 10.17487/RFC6335, August 2011,
            <http://www.rfc-editor.org/info/rfc6335>.

8.2. Informative References

 [RFC2782]  Gulbrandsen, A., Vixie, P., and L. Esibov, "A DNS RR for
            specifying the location of services (DNS SRV)", RFC 2782,
            DOI 10.17487/RFC2782, February 2000,
            <http://www.rfc-editor.org/info/rfc2782>.

Faltstrom & Kolkman Informational [Page 9] RFC 7553 URI Resource Record June 2015

 [RFC2915]  Mealling, M. and R. Daniel, "The Naming Authority Pointer
            (NAPTR) DNS Resource Record", RFC 2915,
            DOI 10.17487/RFC2915, September 2000,
            <http://www.rfc-editor.org/info/rfc2915>.
 [RFC3401]  Mealling, M., "Dynamic Delegation Discovery System (DDDS)
            Part One: The Comprehensive DDDS", RFC 3401,
            DOI 10.17487/RFC3401, October 2002,
            <http://www.rfc-editor.org/info/rfc3401>.
 [RFC3403]  Mealling, M., "Dynamic Delegation Discovery System (DDDS)
            Part Three: The Domain Name System (DNS) Database",
            RFC 3403, DOI 10.17487/RFC3403, October 2002,
            <http://www.rfc-editor.org/info/rfc3403>.
 [RFC3404]  Mealling, M., "Dynamic Delegation Discovery System (DDDS)
            Part Four: The Uniform Resource Identifiers (URI)",
            RFC 3404, DOI 10.17487/RFC3404, October 2002,
            <http://www.rfc-editor.org/info/rfc3404>.
 [RFC3597]  Gustafsson, A., "Handling of Unknown DNS Resource Record
            (RR) Types", RFC 3597, DOI 10.17487/RFC3597, September
            2003, <http://www.rfc-editor.org/info/rfc3597>.
 [RFC3958]  Daigle, L. and A. Newton, "Domain-Based Application
            Service Location Using SRV RRs and the Dynamic Delegation
            Discovery Service (DDDS)", RFC 3958, DOI 10.17487/RFC3958,
            January 2005, <http://www.rfc-editor.org/info/rfc3958>.
 [RFC4592]  Lewis, E., "The Role of Wildcards in the Domain Name
            System", RFC 4592, DOI 10.17487/RFC4592, July 2006,
            <http://www.rfc-editor.org/info/rfc4592>.
 [RFC4848]  Daigle, L., "Domain-Based Application Service Location
            Using URIs and the Dynamic Delegation Discovery Service
            (DDDS)", RFC 4848, DOI 10.17487/RFC4848, April 2007,
            <http://www.rfc-editor.org/info/rfc4848>.
 [RFC5507]  IAB, Faltstrom, P., Ed., Austein, R., Ed., and P. Koch,
            Ed., "Design Choices When Expanding the DNS", RFC 5507,
            DOI 10.17487/RFC5507, April 2009,
            <http://www.rfc-editor.org/info/rfc5507>.

Faltstrom & Kolkman Informational [Page 10] RFC 7553 URI Resource Record June 2015

Appendix A. The Original RRTYPE Allocation Request

 On February 22, 2011 IANA assigned RRTYPE 256 for the URI resource
 record based on a request that followed the procedure documented in
 [BCP42] (which was RFC 6195 at the time but has since been replaced
 by RFC 6895).  The DNS RRTYPE PARAMETER ALLOCATION form as submitted
 to IANA at that time is replicated below for reference.
 Note: Although "ownername" should be "owner name", "ownername" has
 been preserved below because it was part of the original request form
 submitted to IANA.
 A.   Submission Date:
      May 23, 2009
 B.   Submission Type:
      [X] New RRTYPE
      [ ] Modification to existing RRTYPE
 C.   Contact Information for submitter:
      Name: Patrik Faltstrom
      Email Address: paf@cisco.com
      International telephone number: +46-8-6859131
      Other contact handles:
      (Note: This information will be publicly posted.)
 D.   Motivation for the new RRTYPE application?
      There is no easy way to get from a domain name to a URI.  Some
      mechanisms exists via use of the NAPTR [RFC3403] resource
      record.  That implies quite complicated rules that are
      simplified via the S-NAPTR [RFC3958] specification.  But, the
      ability to directly look up a URI still exists.  This
      specification uses a prefix based naming mechanism originated in
      the definition of the SRV [RFC2782] resource record, and the
      RDATA is a URI, encoded as one text field.
      See also above (Section 1).

Faltstrom & Kolkman Informational [Page 11] RFC 7553 URI Resource Record June 2015

 E.   Description of the proposed RR type.
      The format of the URI resource record is as follows:
      Ownername TTL Class URI Priority Weight Target
      The URI RR has service information encoded in its ownername.  In
      order to encode the service for a specific ownername one uses
      service parameters.  Valid service parameters used are either
      Enumservice Registrations registered by IANA, or prefixes used
      for the SRV resource record.
      The wire format of the RDATA is as follows:
                         1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |          Priority             |          Weight               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    /                                                               /
    /                             Target                            /
    /                                                               /
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 F.   What existing RRTYPE or RRTYPEs come closest to filling that
      need and why are they unsatisfactory?
      The RRTYPE that come closest is the NAPTR resource record.  It
      is for example used in the DDDS and S-NAPTR algorithms.  The
      main problem with the NAPTR is that selection of what record (or
      records) one is interested in is based on data stored in the
      RDATA portion of the NAPTR resource record.  This, as explained
      in RFC 5507 [RFC5507], is not optimal for DNS lookups.  Further,
      most applications using NAPTR resource records uses regular
      expression based rewrite rules for creation of the URI, and that
      has shown be complicated to implement.
      The second closest RRTYPE is the SRV record that given a
      prefixed based naming just like is suggested for the URI
      resource record, one get back a port number and domain name.
      This can also be used for creation of a URI, but, only URIs
      without path components.
 G.   What mnemonic is requested for the new RRTYPE (optional)?
      URI

Faltstrom & Kolkman Informational [Page 12] RFC 7553 URI Resource Record June 2015

 H.   Does the requested RRTYPE make use of any existing IANA Registry
      or require the creation of a new IANA sub-registry in DNS
      Parameters?
      Yes, partially.
      One of the mechanisms to select a service is to use the
      Enumservice Registry managed by IANA.  Another is to use
      services and protocols used for SRV records.
 I.   Does the proposal require/expect any changes in DNS servers/
      resolvers that prevent the new type from being processed as an
      unknown RRTYPE (see [RFC3597])?
      No
 J.   Comments:
      None

Faltstrom & Kolkman Informational [Page 13] RFC 7553 URI Resource Record June 2015

Acknowledgements

 Ideas on how to split the two different kinds of queries, "What
 services exists for this domain name" and "What is the URI for this
 service", came from Scott Bradner and Lawrence Conroy.  Other people
 that have contributed to this document include Richard Barnes, Leslie
 Daigle, Victor Dukhovni, Olafur Gudmundsson, Philip Hallam-Baker, Ted
 Hardie, Sam Hartman, Evan Hunt, John Klensin, Peter Koch, Eliot Lear,
 Andy Newton, Mark Nottingham, Penn Pfautz, Jinmei Tatuya, Willem
 Toorop, and Nico Williams.
 Cisco is acknowledged as Mr. Faltstrom's employer at the time this
 document was developed.
 The NLnet Labs is acknowledged as Mr. Kolkman's employer at the time
 this document was developed.

Authors' Addresses

 Patrik Faltstrom
 Netnod
 EMail: paf@netnod.se
 Olaf Kolkman
 Internet Society
 EMail: kolkman@isoc.org

Faltstrom & Kolkman Informational [Page 14]

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