IPv4 Residual Deployment via IPv6 - A Stateless Solution (4rd)
RFC 7600

Document Type RFC - Experimental (July 2015; Errata)
Last updated 2015-07-29
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Document shepherd Suresh Krishnan
Shepherd write-up Show (last changed 2014-07-23)
IESG IESG state RFC 7600 (Experimental)
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Responsible AD Ted Lemon
Send notices to softwire-chairs@ietf.org, draft-ietf-softwire-4rd@ietf.org
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Internet Engineering Task Force (IETF)                        R. Despres
Request for Comments: 7600                                     RD-IPtech
Category: Experimental                                     S. Jiang, Ed.
ISSN: 2070-1721                             Huawei Technologies Co., Ltd
                                                                R. Penno
                                                     Cisco Systems, Inc.
                                                                  Y. Lee
                                                                 Comcast
                                                                 G. Chen
                                                            China Mobile
                                                                 M. Chen
                                                              BBIX, Inc.
                                                               July 2015

     IPv4 Residual Deployment via IPv6 - A Stateless Solution (4rd)

Abstract

   This document specifies a stateless solution for service providers to
   progressively deploy IPv6-only network domains while still offering
   IPv4 service to customers.  The solution's distinctive properties are
   that TCP/UDP IPv4 packets are valid TCP/UDP IPv6 packets during
   domain traversal and that IPv4 fragmentation rules are fully
   preserved end to end.  Each customer can be assigned one public IPv4
   address, several public IPv4 addresses, or a shared address with a
   restricted port set.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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/rfc7600.

Despres, et al.               Experimental                      [Page 1]
RFC 7600        Stateless IPv4 Residual Deployment (4rd)       July 2015

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.

Despres, et al.               Experimental                      [Page 2]
RFC 7600        Stateless IPv4 Residual Deployment (4rd)       July 2015

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................5
   3. The 4rd Model ...................................................7
   4. Protocol Specifications .........................................9
      4.1. NAT44 on CE ................................................9
      4.2. Mapping Rules and Other Domain Parameters .................10
      4.3. Reversible Packet Translations at Domain Entries
           and Exits .................................................11
      4.4. Address Mapping from CE IPv6 Prefixes to 4rd IPv4
           Prefixes ..................................................17
      4.5. Address Mapping from 4rd IPv4 Addresses to 4rd
           IPv6 Addresses ............................................19
      4.6. Fragmentation Processing ..................................23
           4.6.1. Fragmentation at Domain Entry ......................23
           4.6.2. Ports of Fragments Addressed to
                  Shared-Address CEs .................................24
           4.6.3. Packet Identifications from Shared-Address CEs .....26
      4.7. TOS and Traffic Class Processing ..........................26
      4.8. Tunnel-Generated ICMPv6 Error Messages ....................27
      4.9. Provisioning 4rd Parameters to CEs ........................27
   5. Security Considerations ........................................30
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