Mapping of Address and Port using Translation (MAP-T)
RFC 7599

Document Type RFC - Proposed Standard (July 2015; Errata)
Last updated 2018-01-05
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Suresh Krishnan
Shepherd write-up Show (last changed 2014-07-23)
IESG IESG state RFC 7599 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Ted Lemon
Send notices to (None)
IANA IANA review state IANA OK - No Actions Needed
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Internet Engineering Task Force (IETF)                             X. Li
Request for Comments: 7599                                        C. Bao
Category: Standards Track                            Tsinghua University
ISSN: 2070-1721                                              W. Dec, Ed.
                                                                O. Troan
                                                           Cisco Systems
                                                           S. Matsushima
                                                        SoftBank Telecom
                                                             T. Murakami
                                                             IP Infusion
                                                               July 2015

         Mapping of Address and Port using Translation (MAP-T)

Abstract

   This document specifies the solution architecture based on "Mapping
   of Address and Port" stateless IPv6-IPv4 Network Address Translation
   (NAT64) for providing shared or non-shared IPv4 address connectivity
   to and across an IPv6 network.

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/rfc7599.

Li, et al.                   Standards Track                    [Page 1]
RFC 7599                          MAP-T                        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.

Li, et al.                   Standards Track                    [Page 2]
RFC 7599                          MAP-T                        July 2015

Table of Contents

   1. Introduction ....................................................4
   2. Conventions .....................................................4
   3. Terminology .....................................................5
   4. Architecture ....................................................6
   5. Mapping Rules ...................................................8
      5.1. Destinations outside the MAP Domain ........................8
   6. The IPv6 Interface Identifier ...................................9
   7. MAP-T Configuration ............................................10
      7.1. MAP CE ....................................................10
      7.2. MAP BR ....................................................11
   8. MAP-T Packet Forwarding ........................................11
      8.1. IPv4 to IPv6 at the CE ....................................11
      8.2. IPv6 to IPv4 at the CE ....................................12
      8.3. IPv6 to IPv4 at the BR ....................................12
      8.4. IPv4 to IPv6 at the BR ....................................13
   9. ICMP Handling ..................................................13
   10. Fragmentation and Path MTU Discovery ..........................14
      10.1. Fragmentation in the MAP Domain ..........................14
      10.2. Receiving IPv4 Fragments on the MAP Domain Borders .......14
      10.3. Sending IPv4 Fragments to the Outside ....................14
   11. NAT44 Considerations ..........................................15
   12. Usage Considerations ..........................................15
      12.1. EA-Bit Length 0 ..........................................15
      12.2. Mesh and Hub-and-Spoke Modes .............................15
      12.3. Communication with IPv6 Servers in the MAP-T Domain ......15
      12.4. Compatibility with Other NAT64 Solutions .................16
   13. Security Considerations .......................................16
   14. References ....................................................17
      14.1. Normative References .....................................17
      14.2. Informative References ...................................18
   Appendix A. Examples of MAP-T Translation .........................21
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