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Deployment Considerations for Dual-Stack Lite
RFC 6908

Internet Engineering Task Force (IETF)                            Y. Lee
Request for Comments: 6908                                       Comcast
Category: Informational                                      R. Maglione
ISSN: 2070-1721                                            Cisco Systems
                                                             C. Williams
                                                               MCSR Labs
                                                            C. Jacquenet
                                                            M. Boucadair
                                                          France Telecom
                                                              March 2013

             Deployment Considerations for Dual-Stack Lite

Abstract

   This document discusses the deployment issues of and the requirements
   for the deployment and operation of Dual-Stack Lite (DS-Lite).  This
   document describes the various deployment considerations and
   applicability of the DS-Lite architecture.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6908.

Lee, et al.                   Informational                     [Page 1]
RFC 6908          Deployment Considerations for DS-Lite       March 2013

Copyright Notice

   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. Overview ........................................................3
   2. AFTR Deployment Considerations ..................................3
      2.1. Interface Consideration ....................................3
      2.2. MTU and Fragmentation Considerations .......................4
      2.3. Logging at the AFTR ........................................4
      2.4. Blacklisting a Shared IPv4 Address .........................5
      2.5. AFTR's Policies ............................................5
           2.5.1. Outgoing Policy .....................................5
           2.5.2. Incoming Policy .....................................6
      2.6. AFTR Impacts on Accounting Process .........................6
      2.7. Reliability Considerations of AFTR .........................7
      2.8. Strategic Placement of AFTR ................................8
      2.9. AFTR Considerations for Geographically Aware Services ......8
      2.10. Impacts on QoS Policy .....................................9
      2.11. Port Forwarding Considerations ............................9
      2.12. DS-Lite Tunnel Security ..................................10
      2.13. IPv6-Only Network Considerations .........................10
   3. B4 Deployment Considerations ...................................10
      3.1. DNS Deployment Considerations .............................11
      3.2. IPv4 Service Monitoring ...................................11
           3.2.1. B4 Remote Management ...............................11
           3.2.2. IPv4 Connectivity Check ............................11
   4. Security Considerations ........................................12
   5. Acknowledgements ...............................................12
   6. References .....................................................12
      6.1. Normative References ......................................12
      6.2. Informative References ....................................12

Lee, et al.                   Informational                     [Page 2]
RFC 6908          Deployment Considerations for DS-Lite       March 2013

1.  Overview

   DS-Lite [RFC6333] is a transition technique that enables operators to

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