[Docs] [txt|pdf] [Tracker] [Email] [Nits]

Versions: 00 01 02

Network Working Group                                          B. Fenner
Internet-Draft                                     AT&T Labs -- Research
Expires: May 18, 2005                                          M. Duerst
                                               World Wide Web Consortium
                                                       November 17, 2004


        A Format for IPv6 Scope Zone Identifiers in Literal URIs
                      draft-fenner-literal-zone-00

Status of this Memo

   This document is an Internet-Draft and is subject to all provisions
   of section 3 of RFC 3667.  By submitting this Internet-Draft, each
   author represents that any applicable patent or other IPR claims of
   which he or she is aware have been or will be disclosed, and any of
   which he or she become aware will be disclosed, in accordance with
   RFC 3668.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as
   Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on May 18, 2005.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   This document specifies the format to be used when specifying a zone
   identifier with a literal IPv6 address in URIs and IRIs.  While this
   combination is expected to be needed rarely, it is important to
   specify the exact syntax.





Fenner & Duerst           Expires May 18, 2005                  [Page 1]


Internet-Draft      IPv6 Scope Zones in Literal URIs       November 2004


1.  Introduction

   RFC 2396bis [RFC2396bis] defines the IPv6address production for the
   rare case that a literal IPv6 address is required in a URI.  IRIs
   [duerst-iri] copy this syntax.  The IPv6 Scoping Architecture
   [ipv6-scoping-arch] describes the syntax for specifying a zone ID to
   disambiguate an ambiguous scoped address.  Unfortunately, the
   IPv6address production does not permit the format including the zone
   ID, so this document defines a method to specify a zone ID with a
   literal IPv6 address.









































Fenner & Duerst           Expires May 18, 2005                  [Page 2]


Internet-Draft      IPv6 Scope Zones in Literal URIs       November 2004


2.  Format

   The IPvFuture production in URIs and IRIs was created to allow for
   flexibility in defining new IP address formats.  We use this
   flexibility in this format, to add a previously unanticipated address
   format for IPv6.  Therefore, strings matching this grammar also match
   the IPvFuture production in URIs and IRIs.  While the form specified
   in the IPv6 Scoping Architecture [ipv6-scoping-arch]uses a percent
   ("%") to separate the zone ID from the address, this form separates
   the zone ID from the address using an underscore ("_"), to avoid the
   special meaning of the percent ("%") in URIs.


   ; An address matching IPv6scoped-literal also matches
   ; the URI/IRI spec's IP-literal with IPvFuture
   IPv6scoped-literal = "[v6." IPv6scoped-address "]"
   IPv6scoped-address = IPv6address "_" IPv6zone-id
   IPv6zone-id = 1*( unreserved / sub-delims / ":" )


2.1  Tradeoffs

   o  Use _ or Z or some other character as separator.
      Pro:
         +  Fits current ABNF.
         +  Doesn't require confusing percent-encoding.
      Con:
         +  Have to remember different separator.
         +  Can't copy and paste from other forms.  (But that is the
            case also for percent-encoding, which usually doesn't happen
            automatically.)
      Issues:
         +  Zone ID is currently loosely specified in scoping-arch; in
            order to fit this grammar it needs to be tighter.
         +  Should "_" (or whatever delimiter) be allowed in the zone
            ID? ("No" complicates the ABNF)
         +  Can a scoping-arch revision change the character in use? It
            could suggest that "_" can be used as an alternative to "%".
   o  Use %25 as an encoded %, the scoping-arch separator.
      Pro:
         +  "%" is the same character.
      Con:
         +  "%25" is confusing.
         +  Can't copy and paste from other forms where the % is not
            encoded.  (But that is the case also when using a different
            character for the separator.)
         +  IPvFuture ABNF doesn't permit percent-encoded characters.




Fenner & Duerst           Expires May 18, 2005                  [Page 3]


Internet-Draft      IPv6 Scope Zones in Literal URIs       November 2004


      Issues:
         +  Would need to change the IPvFuture grammar in URI and IRI
            specs to permit percent-encoded characters.
















































Fenner & Duerst           Expires May 18, 2005                  [Page 4]


Internet-Draft      IPv6 Scope Zones in Literal URIs       November 2004


3.  IANA Considerations

   This document makes no request of IANA.

   Note to RFC Editor: this section may be removed on publication as an
   RFC.













































Fenner & Duerst           Expires May 18, 2005                  [Page 5]


Internet-Draft      IPv6 Scope Zones in Literal URIs       November 2004


4.  Security Considerations

   RFC 2396bis [RFC2396bis] describes security considerations for URIs;
   this specification does not add any new security considerations.















































Fenner & Duerst           Expires May 18, 2005                  [Page 6]


Internet-Draft      IPv6 Scope Zones in Literal URIs       November 2004


5.  Acknowledgements

   Margaret Wasserman first noticed that the original literal IPv6 form
   didn't support zone IDs.  This document was created based on
   discussions between Steve Bellovin, Brian Carpenter, Roy Fielding,
   Ted Hardie, Larry Masinter, and Thomas Narten.

6  Normative References

   [RFC2234]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", RFC 2234, November 1997.

   [RFC2396bis]
              Berners-Lee, T., Fielding, R. and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax",
              draft-fielding-uri-rfc2396bis-07 (work in progress),
              September 2004.

   [duerst-iri]
              Duerst, M. and M. Suignard, "Internationalized Resource
              Identifiers (IRIs)", draft-duerst-iri-10 (work in
              progress), September 2004.

   [ipv6-scoping-arch]
              Deering, S., "IPv6 Scoped Address Architecture",
              draft-ietf-ipv6-scoping-arch-02 (work in progress), August
              2004.


Authors' Addresses

   Bill Fenner
   AT&T Labs -- Research
   75 Willow Rd
   Menlo Park, California  94025
   USA

   Phone: +1 650-330-7893
   EMail: fenner@research.att.com












Fenner & Duerst           Expires May 18, 2005                  [Page 7]


Internet-Draft      IPv6 Scope Zones in Literal URIs       November 2004


   Martin Duerst
   World Wide Web Consortium
   5322 Endo
   Fujisawa, Kanagawa  252-8520
   Japan

   Phone: +81 466 49 1170
   EMail: duerst@w3.org











































Fenner & Duerst           Expires May 18, 2005                  [Page 8]


Internet-Draft      IPv6 Scope Zones in Literal URIs       November 2004


Intellectual Property Statement

   The IETF takes no position regarding the validity or scope of any
   Intellectual Property Rights or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
   made any independent effort to identify any such rights.  Information
   on the procedures with respect to rights in RFC documents can be
   found in BCP 78 and BCP 79.

   Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at
   ietf-ipr@ietf.org.


Disclaimer of Validity

   This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
   ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
   INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
   INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


Copyright Statement

   Copyright (C) The Internet Society (2004).  This document is subject
   to the rights, licenses and restrictions contained in BCP 78, and
   except as set forth therein, the authors retain all their rights.


Acknowledgment

   Funding for the RFC Editor function is currently provided by the
   Internet Society.




Fenner & Duerst           Expires May 18, 2005                  [Page 9]


Html markup produced by rfcmarkup 1.129c, available from https://tools.ietf.org/tools/rfcmarkup/