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INTERNET-DRAFT                                         John Curran
Expires: August 1, 2008                           January 30, 2008
Intended status: Informational


                     An Internet Transition Plan
                  draft-jcurran-v6transitionplan-02

Status of this Memo

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  This Internet-Draft will expire on  August 1, 2008.

Copyright Notice

  Copyright (C) The IETF Trust (2008).

Abstract

  This memo provides one possible plan for transitioning the Internet
  from a predominantly IPv4-based connectivity model to a predominantly
  IPv6-based connectivity model.

Requirements Language

  The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
  "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
  document are to be interpreted as described in RFC 2119 [RFC2119].






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Table of Contents

  1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
  2.  A Phased Transition Model . . . . . . . . . . . . . . . . . . . 2
  2.1   Preparation Stage . . . . . . . . . . . . . . . . . . . . . . 3
  2.2   Transition  Stage . . . . . . . . . . . . . . . . . . . . . . 4
  2.3   Post-Transition Stage . . . . . . . . . . . . . . . . . . . . 4
  3.  Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
  4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
  5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
  6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 5
  7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
    7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 6
    7.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
  Appendix A.  Change History . . . . . . . . . . . . . . . . . . . . 7
  Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 7
  Intellectual Property and Copyright Statements  . . . . . . . . . . 8


1. Introduction

  This memo provides one possible plan for transitioning the Internet
  from a predominantly IPv4-based connectivity model to a predominantly
  IPv6-based connectivity model.

  Other transition plans are possible and this purely informational
  document does not create an obligation on any party to undertake any
  of the actions specified herein.  The use of RFC 2119 requirements
  language is purely for the purpose of documenting expectations if a
  transition plan were to be adopted by Internet community consensus.

  The purpose of specifying this particular transition plan is to allow
  for overall assessment of the viability of accomplishing the desired
  transition and to continue the discussion of Internet-wide transition
  plans in general.


2. A Phased Transition Model

  It is not reasonable to specify the changes that each and every system
  connected to the Internet must undergo in order to achieve the desired
  transition, as the number of connected systems precludes creating one
  plan that contains such a level of detail.  Further, while there are
  common scenarios that may be specified for transitioning individual
  networks (refer to [RFC3750] [RFC4057] and [CAMPUS]), the specific
  timeline and mechanisms utilized for a given network will be unique.
  Despite these challenges, it is necessary to coordinate expectations
  on an overall basis so that Internet-wide connectivity is maintained
  throughout the transition.


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  This document specifies a three phase transition plan that includes
  preparation, transition, and post-transition phases, and delineates
  the necessary activities within each phase based on the role that an
  organization plays in the provision and use of Internet services.

  An important distinction made in this transition plan is identifying
  the explicit requirement for existing end-site organizations to add
  IPv6-based connectivity to their public-facing servers during a
  transition phase.  An accelerated adoption of IPv6 for public-facing
  servers enables new organizations in the post-transition phase to be
  connected to the Internet only via IPv6 and still have access to a
  substantial representative base of publicly available servers.

  For nearly every organization, the task of IPv6-enabling their public
  facing servers is far easier than undertaking an organization-wide
  adoption of IPv6. Still, the requirement for existing Internet
  connected organizations to add IPv6 connectivity (even to a small
  number of systems) will be a significant hurdle and require a level
  of effort which may not be achievable given the lack of compelling
  additional benefits to these organizations [RFC1669]. This transition
  plan presumes that "connectivity is its own reward" [RFC1958] and
  that there still exists a sufficient level of cooperation among
  Internet participants to make this evolution possible.

  The three proposed phases are: Preparation Phase, Transition Phase,
  and Post-Transition Phase.  The timeline for the phases has been set
  to allow entry to the Post-Transition Phase prior to the projected
  IPv4 address pool exhaustion date [IPUSAGE].


2.1  Preparation Phase - Present to December 2009

  In the Preparation Phase, Service Providers pilot test their
  IPv6 network services, and end-sites prepare to provide Internet
  facing services via IPv6-based connectivity while continuing
  to provide Internet-facing services via IPv4 connectivity.

  During the Preparation Phase, the following principles apply:

  2.1.1 Service Providers SHOULD offer pilot IPv6-based Internet
       Service to their Internet customers.  IPv6-based Internet
       Service MAY be provided via IPv6 transition mechanisms as
       described in [RFC4213] or via native IPv6 network service.
  2.1.2 Organizations SHOULD arrange for IPv6-based Internet
       connectivity for any Internet-facing servers (e.g. web,
       email, and domain name servers).  Internet-facing IPv6
       servers in this phase SHOULD use separate service names
       per [RFC4472] to avoid impact to production IPv4-based
       services unless the organization supports production
       IPv6 connectivity.
  2.1.3 Organizations MAY provide IPv6-based Internet connectivity
       to internal user communities.

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2.2  Transition Phase - January 2010 to December 2011

  In the Transition Phase, Service Providers offer production
  IPv6 and IPv4 services to their Internet customers. End-sites
  provide Internet-facing services in a production manner via
  IPv6-based connectivity in addition to IPv4-based connectivity.

  During the Transition Phase, the following principles apply:

  2.2.1 Service Providers MUST offer IPv6-based Internet Service to
       their Internet customers. IPv6-based Internet Service SHOULD
       be via native IPv6 network service but MAY be via IPv6
       transition mechanisms if necessary.
  2.2.2 Organizations MUST arrange for IPv6-based Internet
       connectivity for any Internet-facing servers (e.g. web,
       email, and domain name servers).  Internet-facing IPv6
       servers SHOULD be treated as production by the organization,
       and SHOULD be treated as production by other Internet
       organizations.
  2.2.3 Organizations SHOULD provide IPv6-based Internet connectivity
       to their internal user communities, and provide IPv6 internal
       supporting servers (e.g. DNS, DHCP). IPv6-based Internet
       connectivity MAY be via native IPv6 network service or MAY
       be via IPv6 transition mechanisms.

2.3 Post-Transition Phase - January 2012 to the Future

  In the Post-Transition Phase, End-Sites provide all Internet-facing
  services via IPv6-based connectivity, thus allowing for new Internet
  customers connected solely by IPv6.

  During the Post-Transition Phase, the following principles apply:
  2.3.1 Service Providers MUST offer IPv6-based Internet Service to
       their Internet customers. IPv6-based Internet Service SHOULD
       be via native IPv6 network service.
  2.3.2 Organizations MUST arrange for IPv6-based Internet connectivity
       for any Internet-facing servers (e.g. web, email, and domain
       name servers).  Internet-facing IPv6 servers MUST be treated
       as production by the organization, and SHOULD be treated as
       production by other Internet organizations.
  2.3.3 Organizations SHOULD provide IPv6-based Internet connectivity to
       internal user communities, and provide IPv6 internal supporting
       servers (e.g. DNS, DHCP)  IPv6-based Internet connectivity SHOULD
       be via native IPv6 network service or MAY be via IPv6 transition
       mechanisms as described in [RFC4213].
  2.3.4 Service Providers area MAY continue to offer IPv4-based Internet
       connectivity to their customers.  Organizations MAY continue to
       use IPv4-based Internet connectivity.

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3. Summary

  In order to facilitate full Internet-wide connectivity during the
  transition from IPv4-based connectivity to IPv6-based connectivity,
  a transition plan which provides clear guidance to organizations
  regarding expectations is necessary.  As the specific expectations
  change over time, and vary greatly by organization, a phased approach
  is specified in this document, with the timeline for each phase set
  with the intention of allowing enough time for the necessary planning
  and deployment steps which each organization much undertake.  This
  Internet Transition Plan provides for transition to predominantly
  IPv6-connectivity by January 2012 which, with careful management, may
  meet the overall requirements of allowing the Internet to scale as
  specified in "The Recommendation for the IP Next Generation Protocol"
  [RFC1752].

4. Security Considerations

  This memo describes the transition of the Internet from IPv4-based
  connectivity to predominantly IPv6-based connectivity.  This change
  inherently has security implications due to the widespread deployment
  of a new version of the Internet Protocol but these are beyond the
  scope of this document and are covered in [RFC4942].  This document
  raises no new security issues itself.

5. IANA Considerations

  While no new name or identifier space is created by this document,
  the policies for management of Internet Protocol version 4 (IPv4)
  address space may not provide for IPv4 availability through the
  Transition Phase as intended by this plan.  The IANA should work with
  all parties to develop policies per [RFC2050] which allow continued
  general availability of IPv4 address resources sufficiently long for
  any transition plan that receives widespread community support.

6. Acknowledgments

  This document would not been possible without the abundant comments
  and suggestions made by members of the Internet community, and in
  particular thanks are due to Jim Bound, Scott Bradner, Randy Bush,
  Geoff Huston, Chris Morrow, Ken Shores, James Woodyatt, David Divins,
  and Jordi Palet for their review and suggestions for improvement.

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7. References

7.1. Normative References

  [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
             Requirement Levels", BCP 14, RFC 2119, March 1997.

  [RFC4213]  Nordmark, E. and R. Gilligan, "Basic Transition
             Mechanisms for IPv6 Hosts and Routers", RFC 4213,
             October 2005.

  [RFC4472]  Durand, A., Ihren, J., and P. Savola, "Operational
             Considerations and Issues with IPv6 DNS", RFC 4472,
             April 2006.

  [RFC1752]  Bradner, S., Mankin, A.," The Recommendation for the
             IP Next Generation Protocol", RFC 1752, Feburary 1995.

7.2. Informative References

  [RFC1958]  Carpenter, B., "Architectural Principles of the Internet",
             RFC 1958, June 1996.

  [RFC1669]  Curran, J., "Market Viability as a IPng Criteria",
             RFC 1669, August 1994.

  [IPUSAGE]  IPv4 Address Report,February 2008, by Geoff Huston.
             <http://www.potaroo.net/tools/ipv4/index.html>

  [RFC4057]  Bound, J., Ed., "IPv6 Enterprise Network Scenarios",
             RFC 4057, June 2005.

  [RFC3750]  Huitema, C., Austein, R., Satapati, S., and R. van der Pol,
             "Unmanaged Networks IPv6 Transition Scenarios", RFC 3750,
             April 2004

  [CAMPUS]   Chown, T., "IPv6 Campus Transition Scenario Description and
             Analysis", (Work in Progress), March 2007.

  [RFC2050]  Hubbard, K., Kosters, M., Conrad, D., Karrenberg, D., and
             J. Postel, "Internet Registry IP Allocation Guidelines",
             BCP 12, RFC 2050, November 1996.

  [RFC4942]  Davies, E., "IPv6 Transition/Coexistence Security
             Considerations", September 2007.

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Appendix A.  Change History

 Changes from -01 version to -02 version:

 o  Clarification of pilot nature of IPv6 services prior to
    start of Transition Phase.

 o  Strengthen use of native IPv6 in Post-Transition Phase.

 Changes from -00 version to -01 version:

 o  Expanded discussion of phased transition model.

 o  Extended Preparation phase by one year to reflect overwhelming
    community concern about the state of IPv6 readiness.

 o  Clarified use of IPv6 services in Preparation phase to advise
    caution with respect to DNS interactions per RFC 4472.

 o  Removed last sentence of Post-Transition phase from removal
    of IPv4-based connectivity. Removal of IPv4 is considered
    out of the scope of this document.

 o  Updated Introduction to clarify use of RFC 2119 terminology
    despite inherently non-standards nature of this document.

 o  Corrected misc typographic errors

 o  Updated acknowledgments section

Author's Address

  John Curran
  99 Otis Street
  Cambridge, MA USA 20190

  Email: jcurran@istaff.org

Full Copyright Statement

  Copyright (C) The IETF Trust (2008).

  This document is subject to the rights, licenses and restrictions
  contained in BCP 78, and except as set forth therein, the authors
  retain all their rights.

  This document and the information contained herein are provided on an
  "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
  OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
  THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
  OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
  THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
  WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


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