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Network Working Group                                          C. Donley
Internet-Draft                                                 CableLabs
Intended status: Informational                             J. Brzozowski
Expires: September 30, 2012                                      Comcast
                                                                  H. Liu
                                                                  D-Link
                                                            V. Kuarsingh
                                                   Rogers Communications
                                                                 J. Weil
                                                       Time Warner Cable
                                                          March 29, 2012


              Design Considerations for an IPv6 CE Router
                 draft-donley-v6ops-ce-router-design-00

Abstract

   This document describes design considerations for IPv6 CE routers.

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/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 30, 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



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   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.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Design Considerations . . . . . . . . . . . . . . . . . . . . . 3
     2.1.  Address acquisition . . . . . . . . . . . . . . . . . . . . 3
     2.2.  Transition technologies . . . . . . . . . . . . . . . . . . 4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   6.  Informative References  . . . . . . . . . . . . . . . . . . . . 5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 5



































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1.  Introduction

   This document descrbes design considerations for IPv6 customer edge
   (CE) routers designed for residential/small business use
   [I-D.ietf-v6ops-6204bis].  These routers may also support IPv4 and
   potentially one/more transition technologies.  These design
   considerations are crafted to ensure a safe and orderly transition to
   IPv6 while maintaining a quality IP connection to the customer
   premise.


2.  Design Considerations

   There are two overriding goals for CE routers:

   o  Offer customers the best possible quality of experience.

   o  Do not unnecessarily overwhelm ISP resources.

2.1.  Address acquisition

   The IPv6 CE router needs to support connectivity to one or more
   access network architectures.  There are generally three IPv6 address
   acquisition mechanisms in widespread use today:

   o  stateful DHCPv6 [RFC3315]

   o  Stateless Address Autoconfiguraton (SLAAC)[RFC4862]

   o  unnumbered

   Design considerations for address acquisition:

   1.  IPv6 CE routers should support one or more of the above address
       acquisition mechanisms.

   2.  Only one address acquisition mechanism should be used for a given
       protocol (e.g. native IPv4/IPv6) at a given time.

   3.  Not all access architectures support all address acquisition
       mechanisms.  When attached to access networks that do not support
       certain address acquisition mechanisms, the CE router should not
       attempt to use unsupported addressing mechanisms, if it is
       possible to identify such a limitation.

   4.  The CE router should attempt address acquisition gracefully.  It
       should not overwhelm service provider provisioning servers.




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   5.  If a Service Provider sends a hint to the CE router as to which
       addressing mechanism to use, the CE router should honor the hint.

2.2.  Transition technologies

   CE routers should support technologies for providing ipv4 access over
   IPv6 networks and IPv6 access over IPv4 networks.  While the IETF has
   defined a large number of such protocols, the CE router need not
   implement all of them.  In particular, it should implement those
   technologies required by ISPs.  At the time of this writing, such
   technologies include:

   o  Native Dual-Stack

   o  IPv6 Rapid Deployment (6RD) [RFC5969]

   o  Dual-Stack Lite (DS-Lite)[RFC6333]

   Design considerations for transition technologies:

   1.  Native IPv4/IPv6 service should be preferred over tunneled
       service.

   2.  Avoid NAT, when possible.  [I-D.donley-nat444-impacts]

   3.  While multihoming (supporting both native/tunneled service for a
       given protocol) may be a valid approach, it need not be
       supported.  Singlehoming should also be considered a valid
       approach.


3.  IANA Considerations

   This document makes no request of IANA.

   Note to RFC Editor: this section may be removed on publication as an
   RFC.


4.  Security Considerations

   TBD


5.  Acknowledgements






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6.  Informative References

   [I-D.donley-nat444-impacts]
              Donley, C., Howard, L., Colorado, U., and V. Kuarsingh,
              "Assessing the Impact of Carrier-Grade NAT on Network
              Applications", draft-donley-nat444-impacts-03 (work in
              progress), November 2011.

   [I-D.ietf-v6ops-6204bis]
              Singh, H., Beebee, W., Donley, C., Stark, B., and O.
              Troan, "Basic Requirements for IPv6 Customer Edge
              Routers", draft-ietf-v6ops-6204bis-07 (work in progress),
              March 2012.

   [RFC3315]  Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C.,
              and M. Carney, "Dynamic Host Configuration Protocol for
              IPv6 (DHCPv6)", RFC 3315, July 2003.

   [RFC4862]  Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless
              Address Autoconfiguration", RFC 4862, September 2007.

   [RFC5969]  Townsley, W. and O. Troan, "IPv6 Rapid Deployment on IPv4
              Infrastructures (6rd) -- Protocol Specification",
              RFC 5969, August 2010.

   [RFC6333]  Durand, A., Droms, R., Woodyatt, J., and Y. Lee, "Dual-
              Stack Lite Broadband Deployments Following IPv4
              Exhaustion", RFC 6333, August 2011.


Authors' Addresses

   Chris Donley
   CableLabs

   Email: c.donley@cablelabs.com


   John Brzozowski
   Comcast


   Hans Liu
   D-Link







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   Victor Kuarsingh
   Rogers Communications


   Jason Weil
   Time Warner Cable













































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