Gateway Initiated Dual-Stack Lite Deployment
draft-ietf-softwire-gateway-init-ds-lite-07

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Document Type Active Internet-Draft (softwire WG)
Last updated 2012-04-22
Replaces draft-gundavelli-softwire-gateway-init-ds-lite, draft-softwire-gateway-init-ds-lite
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Send notices to softwire-chairs@tools.ietf.org, draft-ietf-softwire-gateway-init-ds-lite@tools.ietf.org
SOFTWIRE WG                                                 F. Brockners
Internet-Draft                                             S. Gundavelli
Intended status: Standards Track                                   Cisco
Expires: October 24, 2012                                    S. Speicher
                                                     Deutsche Telekom AG
                                                                 D. Ward
                                                                   Cisco
                                                          April 22, 2012

              Gateway Initiated Dual-Stack Lite Deployment
              draft-ietf-softwire-gateway-init-ds-lite-07

Abstract

   Gateway-Initiated Dual-Stack lite (GI-DS-lite) is a variant of Dual-
   Stack lite (DS-lite) applicable to certain tunnel-based access
   architectures.  GI-DS-lite extends existing access tunnels beyond the
   access gateway to an IPv4-IPv4 NAT using softwires with an embedded
   context identifier that uniquely identifies the end-system the
   tunneled packets belong to.  The access gateway determines which
   portion of the traffic requires NAT using local policies and sends/
   receives this portion to/from this softwire.

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
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   This Internet-Draft will expire on October 24, 2012.

Copyright Notice

   Copyright (c) 2012 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

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   (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
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   described in the Simplified BSD License.

Table of Contents

   1.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Gateway Initiated DS-Lite  . . . . . . . . . . . . . . . . . .  4
   4.  Protocol and related Considerations  . . . . . . . . . . . . .  6
   5.  Softwire Management and related Considerations . . . . . . . .  7
   6.  Softwire Embodiments . . . . . . . . . . . . . . . . . . . . .  7
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     10.1.  Normative References  . . . . . . . . . . . . . . . . . . 10
     10.2.  Informative References  . . . . . . . . . . . . . . . . . 11
   Appendix A.  GI-DS-lite deployment . . . . . . . . . . . . . . . . 11
     A.1.   Connectivity establishment: Example call flow . . . . . . 12
     A.2.   GI-DS-lite applicability: Examples  . . . . . . . . . . . 13
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13

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1.  Overview

   Gateway-Initiated Dual-Stack lite (GI-DS-lite) is a variant of the
   Dual-Stack lite (DS-lite) [RFC6333], applicable to network
   architectures which use point to point tunnels between the access
   device and the access gateway.  The access gateway in these models is
   designed to serve large numbers of access devices.  Mobile
   architectures based on Mobile IPv6 [RFC6275], Proxy Mobile IPv6
   [RFC5213], or GTP [TS29060], as well as broadband architectures based
   on PPP or point-to-point VLANs as defined by the Broadband Forum
   [TR59] and [TR101] are examples for this type of architecture.

   The DS-lite approach leverages IPv4-in-IPv6 tunnels (or other
   tunneling modes) for carrying the IPv4 traffic from the customer
   network to the Address Family Transition Router (AFTR).  An
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