IPv6 Addressing of IPv4/IPv6 Translators
RFC 6052

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Internet Engineering Task Force (IETF)                            C. Bao
Request for Comments: 6052             CERNET Center/Tsinghua University
Updates: 4291                                                 C. Huitema
Category: Standards Track                          Microsoft Corporation
ISSN: 2070-1721                                               M. Bagnulo
                                                                    UC3M
                                                            M. Boucadair
                                                          France Telecom
                                                                   X. Li
                                       CERNET Center/Tsinghua University
                                                            October 2010

                IPv6 Addressing of IPv4/IPv6 Translators

Abstract

   This document discusses the algorithmic translation of an IPv6
   address to a corresponding IPv4 address, and vice versa, using only
   statically configured information.  It defines a well-known prefix
   for use in algorithmic translations, while allowing organizations to
   also use network-specific prefixes when appropriate.  Algorithmic
   translation is used in IPv4/IPv6 translators, as well as other types
   of proxies and gateways (e.g., for DNS) used in IPv4/IPv6 scenarios.

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/rfc6052.

Bao, et al.                  Standards Track                    [Page 1]
RFC 6052        IPv6 Addressing of IPv4/IPv6 Translators    October 2010

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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Applicability Scope  . . . . . . . . . . . . . . . . . . .  3
     1.2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . .  4
     1.3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  IPv4-Embedded IPv6 Address Prefix and Format . . . . . . . . .  5
     2.1.  Well-Known Prefix  . . . . . . . . . . . . . . . . . . . .  5
     2.2.  IPv4-Embedded IPv6 Address Format  . . . . . . . . . . . .  5
     2.3.  Address Translation Algorithms . . . . . . . . . . . . . .  7
     2.4.  Text Representation  . . . . . . . . . . . . . . . . . . .  7
   3.  Deployment Guidelines  . . . . . . . . . . . . . . . . . . . .  8
     3.1.  Restrictions on the Use of the Well-Known Prefix . . . . .  8
     3.2.  Impact on Inter-Domain Routing . . . . . . . . . . . . . .  8
     3.3.  Choice of Prefix for Stateless Translation Deployments . .  9
     3.4.  Choice of Prefix for Stateful Translation Deployments  . . 11
   4.  Design Choices . . . . . . . . . . . . . . . . . . . . . . . . 12
     4.1.  Choice of Suffix . . . . . . . . . . . . . . . . . . . . . 12
     4.2.  Choice of the Well-Known Prefix  . . . . . . . . . . . . . 13
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 14
     5.1.  Protection against Spoofing  . . . . . . . . . . . . . . . 14
     5.2.  Secure Configuration . . . . . . . . . . . . . . . . . . . 15
     5.3.  Firewall Configuration . . . . . . . . . . . . . . . . . . 15
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 15
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
   8.  Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 16
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 17
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 17

Bao, et al.                  Standards Track                    [Page 2]
RFC 6052        IPv6 Addressing of IPv4/IPv6 Translators    October 2010

1.  Introduction

   This document is part of a series of IPv4/IPv6 translation documents.