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Stateless Source Address Mapping for ICMPv6 Packets
RFC 6791

Internet Engineering Task Force (IETF)                             X. Li
Request for Comments: 6791                                        C. Bao
Updates: 6145                          CERNET Center/Tsinghua University
Category: Standards Track                                        D. Wing
ISSN: 2070-1721                                         R. Vaithianathan
                                                                   Cisco
                                                               G. Huston
                                                                   APNIC
                                                           November 2012

          Stateless Source Address Mapping for ICMPv6 Packets

Abstract

   A stateless IPv4/IPv6 translator may receive ICMPv6 packets
   containing non-IPv4-translatable addresses as the source.  These
   packets should be passed across the translator as ICMP packets
   directed to the IPv4 destination.  This document presents
   recommendations for source address translation in ICMPv6 headers to
   handle such cases.

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/rfc6791.

Li, et al.                   Standards Track                    [Page 1]
RFC 6791            Source Address Mapping for ICMPv6      November 2012

Copyright Notice

   Copyright (c) 2012 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . . . 3
   3.  Problem Statement and Considerations  . . . . . . . . . . . . . 3
     3.1.  Considerations  . . . . . . . . . . . . . . . . . . . . . . 3
     3.2.  Recommendations . . . . . . . . . . . . . . . . . . . . . . 3
   4.  ICMP Extension  . . . . . . . . . . . . . . . . . . . . . . . . 4
   5.  Stateless Address Mapping Algorithm . . . . . . . . . . . . . . 4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 4
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 5

1.  Introduction

   Section 5.3 of "IP/ICMP Translation Algorithm" [RFC6145] states that
   "the IPv6 addresses in the IPv6 header may not be IPv4-translatable
   addresses and there will be no corresponding IPv4 addresses
   representing this IPv6 address.  In this case, the translator can do
   stateful translation.  A mechanism by which the translator can
   instead do stateless translation of this address is left for future
   work."  This document, "Stateless Source Address Mapping for ICMPv6
   Packets", provides recommendations for this case.

   For the purposes of this document, the term "IPv4-translatable IPv6
   address" is as defined in Section 2.2 of [RFC6052].

Li, et al.                   Standards Track                    [Page 2]
RFC 6791            Source Address Mapping for ICMPv6      November 2012

2.  Notational Conventions

   The key words MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
   SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
   document, are to be interpreted as described in [RFC2119].

3.  Problem Statement and Considerations

   When a stateless IPv4/IPv6 translator receives an ICMPv6 message
   [RFC4443] (for example, "Packet Too Big") sourced from a non-IPv4-
   translatable IPv6 address and bound for an IPv4-translatable IPv6

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