Lightweight 4over6: An Extension to the DS-Lite Architecture
draft-ietf-softwire-lw4over6-00

The information below is for an old version of the document
Document Type Active Internet-Draft (softwire WG)
Authors Yong Cui  , Qiong Sun  , Mohamed Boucadair  , Tina Tsou  , Yiu Lee  , Ian Farrer 
Last updated 2013-04-10
Replaces draft-cui-softwire-b4-translated-ds-lite
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Softwire Working Group                                            Y. Cui
Internet-Draft                                       Tsinghua University
Intended status: Standards Track                                  Q. Sun
Expires: October 12, 2013                                  China Telecom
                                                            M. Boucadair
                                                          France Telecom
                                                                 T. Tsou
                                                     Huawei Technologies
                                                                  Y. Lee
                                                                 Comcast
                                                               I. Farrer
                                                     Deutsche Telekom AG
                                                          April 10, 2013

      Lightweight 4over6: An Extension to the DS-Lite Architecture
                    draft-ietf-softwire-lw4over6-00

Abstract

   DS-Lite [RFC6333] 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
   Translation function from the DS-Lite AFTR to the B4, removing the
   requirement for a Carrier Grade NAT function in the AFTR.  This
   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 B4s.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 12, 2013.

Copyright Notice

Cui, et al.             Expires October 12, 2013                [Page 1]
Internet-Draft            B4-translated DS-Lite               April 2013

   Copyright (c) 2013 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  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Lightweight 4over6 Architecture  . . . . . . . . . . . . . . .  5
   5.  Lightweight B4 Behavior  . . . . . . . . . . . . . . . . . . .  7
     5.1.  Lightweight B4 Provisioning  . . . . . . . . . . . . . . .  7
     5.2.  Lightweight B4 Data Plane Behavior . . . . . . . . . . . .  8
   6.  Lightweight AFTR Behavior  . . . . . . . . . . . . . . . . . .  9
     6.1.  Binding Table Maintenance  . . . . . . . . . . . . . . . .  9
     6.2.  lwAFTR Data Plane Behavior . . . . . . . . . . . . . . . . 10
   7.  Provisioning of IPv4 address and Port Set  . . . . . . . . . . 11
   8.  ICMP Processing  . . . . . . . . . . . . . . . . . . . . . . . 12
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 13
   11. Author List  . . . . . . . . . . . . . . . . . . . . . . . . . 13
   12. Acknowledgement  . . . . . . . . . . . . . . . . . . . . . . . 16
   13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     13.1. Normative References . . . . . . . . . . . . . . . . . . . 16
     13.2. Informative References . . . . . . . . . . . . . . . . . . 17
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 18

Cui, et al.             Expires October 12, 2013                [Page 2]
Internet-Draft            B4-translated DS-Lite               April 2013

1.  Introduction

   Dual-Stack Lite (DS-Lite, [RFC6333]) defines a model for providing
   IPv4 access over an IPv6 network using two well-known technologies:
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