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Wireline Incremental IPv6
RFC 6782

Internet Engineering Task Force (IETF)                 V. Kuarsingh, Ed.
Request for Comments: 6782                         Rogers Communications
Category: Informational                                        L. Howard
ISSN: 2070-1721                                        Time Warner Cable
                                                           November 2012

                       Wireline Incremental IPv6

Abstract

   Operators worldwide are in various stages of preparing for or
   deploying IPv6 in their networks.  These operators often face
   difficult challenges related to IPv6 introduction, along with those
   related to IPv4 run-out.  Operators will need to meet the
   simultaneous needs of IPv6 connectivity and continue support for IPv4
   connectivity for legacy devices with a stagnant supply of IPv4
   addresses.  The IPv6 transition will take most networks from an IPv4-
   only environment to an IPv6-dominant environment with long transition
   periods varying by operator.  This document helps provide a framework
   for wireline providers who are faced with the challenges of
   introducing IPv6 along with meeting the legacy needs of IPv4
   connectivity, utilizing well-defined and commercially available IPv6
   transition technologies.

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/rfc6782.

Kuarsingh & Howard            Informational                     [Page 1]
RFC 6782                Wireline Incremental IPv6          November 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.

Kuarsingh & Howard            Informational                     [Page 2]
RFC 6782                Wireline Incremental IPv6          November 2012

Table of Contents

   1. Introduction ....................................................4
   2. Operator Assumptions ............................................4
   3. Reasons and Considerations for a Phased Approach ................5
      3.1. Relevance of IPv6 and IPv4 .................................6
      3.2. IPv4 Resource Challenges ...................................6
      3.3. IPv6 Introduction and Operational Maturity .................7
      3.4. Service Management .........................................8
      3.5. Suboptimal Operation of Transition Technologies ............8
      3.6. Future IPv6 Network ........................................9
   4. IPv6 Transition Technology Analysis .............................9
      4.1. Automatic Tunneling Using 6to4 and Teredo .................10
      4.2. Carrier-Grade NAT (NAT444) ................................10
      4.3. 6rd .......................................................11
      4.4. Native Dual Stack .........................................11
      4.5. DS-Lite ...................................................12
      4.6. NAT64 .....................................................12
   5. IPv6 Transition Phases .........................................13
      5.1. Phase 0 - Foundation ......................................13
           5.1.1. Phase 0 - Foundation: Training .....................13
           5.1.2. Phase 0 - Foundation: System Capabilities ..........14
           5.1.3. Phase 0 - Foundation: Routing ......................14
           5.1.4. Phase 0 - Foundation: Network Policy and Security ..15
           5.1.5. Phase 0 - Foundation: Transition Architecture ......15
           5.1.6. Phase 0 - Foundation: Tools and Management .........16
      5.2. Phase 1 - Tunneled IPv6 ...................................16

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