Lightweight 4over6: An Extension to the Dual-Stack Lite Architecture
RFC 7596

Document Type RFC - Proposed Standard (July 2015; No errata)
Last updated 2015-10-14
Replaces draft-cui-softwire-b4-translated-ds-lite
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Suresh Krishnan
Shepherd write-up Show (last changed 2014-06-19)
IESG IESG state RFC 7596 (Proposed Standard)
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Responsible AD Ted Lemon
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IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                            Y. Cui
Request for Comments: 7596                           Tsinghua University
Category: Standards Track                                         Q. Sun
ISSN: 2070-1721                                            China Telecom
                                                            M. Boucadair
                                                          France Telecom
                                                                 T. Tsou
                                                     Huawei Technologies
                                                                  Y. Lee
                                                                 Comcast
                                                               I. Farrer
                                                     Deutsche Telekom AG
                                                               July 2015

  Lightweight 4over6: An Extension to the Dual-Stack Lite Architecture

Abstract

   Dual-Stack Lite (DS-Lite) (RFC 6333) describes an architecture for
   transporting IPv4 packets over an IPv6 network.  This document
   specifies an extension to DS-Lite called "Lightweight 4over6", which
   moves the Network Address and Port Translation (NAPT) function from
   the centralized DS-Lite tunnel concentrator to the tunnel client
   located in the Customer Premises Equipment (CPE).  This removes the
   requirement for a Carrier Grade NAT function in the tunnel
   concentrator and reduces the amount of centralized state that must be
   held to a per-subscriber level.  In order to delegate the NAPT
   function and make IPv4 address sharing possible, port-restricted IPv4
   addresses are allocated to the CPEs.

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/rfc7596.

Cui, et al.                  Standards Track                    [Page 1]
RFC 7596                   Lightweight 4over6                  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.

Table of Contents

   1. Introduction ....................................................3
   2. Conventions .....................................................4
   3. Terminology .....................................................5
   4. Lightweight 4over6 Architecture .................................6
   5. Lightweight B4 Behavior .........................................7
      5.1. Lightweight B4 Provisioning with DHCPv6 ....................7
      5.2. Lightweight B4 Data-Plane Behavior ........................10
           5.2.1. Fragmentation Behavior .............................11
   6. Lightweight AFTR Behavior ......................................12
      6.1. Binding Table Maintenance .................................12
      6.2. lwAFTR Data-Plane Behavior ................................13
   7. Additional IPv4 Address and Port-Set Provisioning Mechanisms ...14
   8. ICMP Processing ................................................14
      8.1. ICMPv4 Processing by the lwAFTR ...........................15
      8.2. ICMPv4 Processing by the lwB4 .............................15
   9. Security Considerations ........................................15
   10. References ....................................................16
      10.1. Normative References .....................................16
      10.2. Informative References ...................................17
   Acknowledgements ..................................................19
   Contributors ......................................................19
   Authors' Addresses ................................................21

Cui, et al.                  Standards Track                    [Page 2]
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