Essential Correction for IPv6 ABNF and URI Comparison in RFC 3261
RFC 5954
| Document | Type |
RFC - Proposed Standard
(August 2010; Errata)
Updates RFC 3261
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-gurbani-sip-ipv6-abnf-fix | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5954 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Robert Sparks | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) V. Gurbani, Ed.
Request for Comments: 5954 Bell Laboratories, Alcatel-Lucent
Updates: 3261 B. Carpenter, Ed.
Category: Standards Track Univ. of Auckland
ISSN: 2070-1721 B. Tate, Ed.
BroadSoft
August 2010
Essential Correction for IPv6 ABNF and URI Comparison in RFC 3261
Abstract
This document corrects the Augmented Backus-Naur Form (ABNF)
production rule associated with generating IPv6 literals in RFC 3261.
It also clarifies the rule for Uniform Resource Identifier (URI)
comparison when the URIs contain textual representation of IP
addresses.
Status of This Memo
This is an Internet Standards Track document.
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). Further information on
Internet Standards is available in 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/rfc5954.
Copyright Notice
Copyright (c) 2010 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.
Gurbani, et al. Standards Track [Page 1]
RFC 5954 SIP IPv6 ABNF August 2010
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Problem Statement . . . . . . . . . . . . . . . . . . . . . . . 2
3.1. Extra Colon in IPv4-Mapped IPv6 Address . . . . . . . . . . 2
3.2. Comparing URIs with Textual Representation of IP
Addresses . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. Resolution for Extra Colon in IPv4-Mapped IPv6 Address . . 4
4.2. Clarification for Comparison of URIs with Textual
Representation of IP Addresses . . . . . . . . . . . . . . 5
5. Generating a Canonical IPv6 Textual Representation . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 6
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . . 6
8.2. Informative References . . . . . . . . . . . . . . . . . . 6
1. Introduction
This document corrects the Augmented Backus-Naur Form (ABNF)
production rule associated with generating IPv6 literals in RFC 3261
[1]. It also clarifies the rule for Uniform Resource Identifier
(URI) comparison when the URIs contain textual representation of IP
addresses.
2. Terminology
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 RFC 2119 [2].
3. Problem Statement
3.1. Extra Colon in IPv4-Mapped IPv6 Address
The ABNF [4] for generating IPv6 literals in RFC 3261 [1] is
incorrect. When generating IPv4-mapped IPv6 addresses, the
production rule may actually generate the following construct:
[2001:db8:::192.0.2.1] - Note the extra colon before the IPv4
address.
The correct construct, of course, would only include two colons
before the IPv4 address.
Gurbani, et al. Standards Track [Page 2]
RFC 5954 SIP IPv6 ABNF August 2010
Historically, the ABNF pertaining to IPv6 references in RFC 3261
was derived from Appendix B of RFC 2373 [7], which was flawed to
begin with (see errata for RFC 2373 [8]). RFC 2373 has been
subsequently obsoleted by RFC 4291 [6].
The ABNF for IPv6reference is reproduced from RFC 3261 below:
IPv6reference = "[" IPv6address "]"
IPv6address = hexpart [ ":" IPv4address ]
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