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Gateway-Initiated Dual-Stack Lite Deployment
RFC 6674

Internet Engineering Task Force (IETF)                      F. Brockners
Request for Comments: 6674                                 S. Gundavelli
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                              S. Speicher
                                                     Deutsche Telekom AG
                                                                 D. Ward
                                                                   Cisco
                                                               July 2012

              Gateway-Initiated Dual-Stack Lite Deployment

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 to which
   the tunneled packets belong.  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 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/rfc6674.

Brockners, et al.            Standards Track                    [Page 1]
RFC 6674                Gateway-Initiated DS-Lite              July 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
   (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.  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 . . . . . . . . . . . . . . . . . . . . .  8
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 12
   Appendix A.  GI-DS-Lite Deployment . . . . . . . . . . . . . . . . 13
     A.1.  Connectivity Establishment: Example Call Flow  . . . . . . 13
     A.2.  GI-DS-Lite Applicability: Examples . . . . . . . . . . . . 14

Brockners, et al.            Standards Track                    [Page 2]
RFC 6674                Gateway-Initiated DS-Lite              July 2012

1.  Overview

   Gateway-Initiated Dual-Stack Lite (GI-DS-Lite) is a variant of Dual-
   Stack Lite (DS-Lite) [RFC6333], applicable to network architectures
   that 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 GPRS
   Tunnelling Protocol (GTP) [TS29060], as well as broadband
   architectures based on PPP or point-to-point VLANs as defined by the
   Broadband Forum [TR59][TR101], are examples of 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
   established softwire between the AFTR and the access device is used
   for traffic-forwarding purposes.  This makes the inner IPv4 address

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