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V6OPSB. Carpenter
Internet-DraftUniv. of Auckland
Intended status: InformationalS. Jiang
Expires: June 4, 2011Huawei Technologies Co., Ltd
 V. Kuarsingh
 Rogers Communications
 December 1, 2010


Framework for IP Version Transition Scenarios
draft-ietf-v6ops-v4v6tran-framework-00

Abstract

This document sets out a framework for the presentation of scenarios and recommendations for a variety of approaches to the transition from IPv4 to IPv6, given the necessity for a long period of co-existence of the two protocols.

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 working documents as Internet-Drafts. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/.

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This Internet-Draft will expire on June 4, 2011.

Copyright Notice

Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved.

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Table of Contents

1.  Introduction
2.  Document Topics
3.  Security Considerations
4.  IANA Considerations
5.  Acknowledgements
6.  Change log
7.  Informative References
§  Authors' Addresses




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1.  Introduction

This document sets out a framework for the presentation of scenarios and recommendations for a variety of approaches to the transition from IPv4 to IPv6, given the necessity for a long period of co-existence of the two protocols. A general "call to arms" for transition is found in [RFC5211] (Curran, J., “An Internet Transition Plan,” July 2008.), and a recommendation for four principal scenarios is given in [I‑D.arkko‑ipv6‑transition‑guidelines] (Arkko, J. and F. Baker, “Guidelines for Using IPv6 Transition Mechanisms during IPv6 Deployment,” November 2010.). A report on experience and plans of various Internet Service Providers (ISPs) is given in [RFC6036] (Carpenter, B. and S. Jiang, “Emerging Service Provider Scenarios for IPv6 Deployment,” October 2010.). However, it is clear that operators require more detailed technical recommendations than are available so far. A companion document [reference TBD] provides a technical problem statement. Unfortunately, the number of different combinations of existing IPv4 deployment models, customer profiles and requirements, and possible coexistence and transition models, is enormous, so it is quite impracticable to produce either a set of recommendations for each case, or a recommended "one size fits all" model. That is why this document proposes a set of topics or dimensions, as a framework for a reasonable number of recommendation documents.

The reader is assumed to be familiar with IPv6. The IETF's view of core IPv6 requirements is to be found in [RFC4294] (Loughney, J., “IPv6 Node Requirements,” April 2006.) (currently being updated as [I‑D.ietf‑6man‑node‑req‑bis] (Jankiewicz, E., Loughney, J., and T. Narten, “IPv6 Node Requirements RFC 4294-bis,” October 2010.)). However, this does not give a complete view of mechanisms an ISP may need to deploy, since it considers the requirements for an individual node, not for a network or service infrastructure as a whole.

[RFC4029] (Lind, M., Ksinant, V., Park, S., Baudot, A., and P. Savola, “Scenarios and Analysis for Introducing IPv6 into ISP Networks,” March 2005.) discussed scenarios for introducing IPv6 into ISP networks, as the problem was viewed some years ago. Its end goal was simply a dual-stack ISP backbone. Today's view is that this is insufficient, as it does not allow for prolonged interworking between IPv6-only and legacy (IPv4-only) hosts. Indeed, the end goal today might be an IPv6-only ISP backbone, with some form of legacy IPv4 support [I‑D.arkko‑ipv6‑transition‑guidelines] (Arkko, J. and F. Baker, “Guidelines for Using IPv6 Transition Mechanisms during IPv6 Deployment,” November 2010.).

Although the basic IPv6 standards are stable, considerable work continues in several IETF working groups, on issues such as multihoming, tunneling, and IP layer interworking between IPv6-only and IPv4-only hosts. However, operators faced with IPv4 address exhaustion in the coming few years need immediate guidance. These operators cannot avoid the need for general skills acquisition, or the need to write their own detailed deployment plan, but they also need guidance for generic scenarios similar to their actual situation. They cannot obtain such guidance from individual protocol specifications developed by the IETF, so there is a need for additional documents.



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2.  Document Topics

On the assumption that a series of documents are produced describing and recommending transition scenarios, there are two basic conditions:

  1. The documents will not be primary protocol specifications, because those are the outcome of IETF working groups chartered to work on specific protocol mechanisms.
  2. The documents are addressed to service providers who have taken the decision to support IPv6, have acquired basic knowledge and skills, have determined how they will obtain upstream IPv6 connectivity, and are ready to write their operational plan for transition.

The documents should each cover some or all of the following aspects or dimensions:

A desirable outcome would be a set of Best Current Practice (BCP) or advisory (Informational) documents for a range of generic deployment models and how they fit into a network, including key services such as subscriber authentication, DHCP, and DNS. However, it must not be forgotten that every service provider is different and such documents can never replace specific deployment plans drawn up by each individual service provider.



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3.  Security Considerations

Service providers will insist on having security for IPv6 services, and for all transition technologies, that is at least as good as for IPv4 services in all respects. Particular attention must be paid to security exposures that are specific to transition and coexistence mechanisms. Thus, all recommendations for transition scenarios must include any security aspects that are specific to that scenario.



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4.  IANA Considerations

This document makes no request of the IANA.



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5.  Acknowledgements

Useful comments and contributions were made by ... and others.

This document was produced using the xml2rfc tool [RFC2629] (Rose, M., “Writing I-Ds and RFCs using XML,” June 1999.).



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6.  Change log

draft-ietf-v6ops-v4v6tran-framework-00: adopted by WG at IETF 79, 2010-12-01

draft-carpenter-v4v6tran-framework-00: original version, 2010-08-18



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7. Informative References

[I-D.arkko-ipv6-transition-guidelines] Arkko, J. and F. Baker, “Guidelines for Using IPv6 Transition Mechanisms during IPv6 Deployment,” draft-arkko-ipv6-transition-guidelines-08 (work in progress), November 2010 (TXT).
[I-D.ietf-6man-node-req-bis] Jankiewicz, E., Loughney, J., and T. Narten, “IPv6 Node Requirements RFC 4294-bis,” draft-ietf-6man-node-req-bis-06 (work in progress), October 2010 (TXT).
[RFC2629] Rose, M., “Writing I-Ds and RFCs using XML,” RFC 2629, June 1999 (TXT, HTML, XML).
[RFC4029] Lind, M., Ksinant, V., Park, S., Baudot, A., and P. Savola, “Scenarios and Analysis for Introducing IPv6 into ISP Networks,” RFC 4029, March 2005 (TXT).
[RFC4294] Loughney, J., “IPv6 Node Requirements,” RFC 4294, April 2006 (TXT).
[RFC5211] Curran, J., “An Internet Transition Plan,” RFC 5211, July 2008 (TXT).
[RFC6036] Carpenter, B. and S. Jiang, “Emerging Service Provider Scenarios for IPv6 Deployment,” RFC 6036, October 2010 (TXT).


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Authors' Addresses

  Brian Carpenter
  Department of Computer Science
  University of Auckland
  PB 92019
  Auckland, 1142
  New Zealand
Email:  brian.e.carpenter@gmail.com
  
  Sheng Jiang
  Huawei Technologies Co., Ltd
  KuiKe Building, No.9 Xinxi Rd.,
  Shang-Di Information Industry Base, Hai-Dian District, Beijing
  P.R. China
Email:  shengjiang@huawei.com
  
  Victor Kuarsingh
  Rogers Communications
  Canada
Email:  Victor.Kuarsingh@rci.rogers.com