DHCPv4 over IPv6 Transport
draft-ietf-dhc-dhcpv4-over-ipv6-00

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Document Type Active Internet-Draft (dhc WG)
Last updated 2011-11-30
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Network Working Group                                             Y. Cui
Internet-Draft                                                     P. Wu
Intended status: Standards Track                                   J. Wu
Expires: June 2, 2012                                Tsinghua University
                                                                T. Lemon
                                                           Nominum, Inc.
                                                       November 30, 2011

                       DHCPv4 over IPv6 Transport
                   draft-ietf-dhc-dhcpv4-over-ipv6-00

Abstract

   Recently, there are demands arising for IPv4 address allocation under
   IPv6 environment, especially in IPv6 transition scenarios.  This
   document describes the mechanism to survive DHCPv4 over IPv6 network.
   DHCPv4 messages are transported in IPv6 packets when traversing the
   IPv6 network.  DHCPv4 protocol behavior of the client and server is
   extended to support this IPv6 transport.  For the relay case, a new
   suboption of the Relay Agent Information Option is defined to carry
   the remote IPv6 address of the clients.

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 June 2, 2012.

Copyright Notice

   Copyright (c) 2011 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

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   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.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . . . 3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   4.  Protocol Summary  . . . . . . . . . . . . . . . . . . . . . . . 4
   5.  Client Relay Agent IPv6 Address Sub-option  . . . . . . . . . . 6
   6.  Client Relay Agent Behavior . . . . . . . . . . . . . . . . . . 6
   7.  IPv6-Transport Server Behavior  . . . . . . . . . . . . . . . . 7
   8.  IPv6-Transport Relay Agent Behavior . . . . . . . . . . . . . . 7
   9.  Security Consideration  . . . . . . . . . . . . . . . . . . . . 8
   10. IANA consideration  . . . . . . . . . . . . . . . . . . . . . . 8
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     11.1.  Normative References . . . . . . . . . . . . . . . . . . . 8
     11.2.  Informative References . . . . . . . . . . . . . . . . . . 8

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1.  Introduction

   DHCPv4 [RFC2131] was not designed with IPv6 consideration.  In
   particular, DHCPv4 cannot work on the IPv6 network.  However, with
   IPv4-IPv6 coexistence coming to reality, the demand of allocating
   IPv4 address under IPv6 environment naturally arises.  To meet this
   demand, DHCPv4 should be extended to run over the IPv6 network.

   A typical scenario that probably requires this feature is IPv4-over-
   IPv6 hub and spoke tunnel [RFC4925].  In this scenario, IPv4-over-
   IPv6 tunnel is used to provide IPv4 connectivity to end users (hosts
   or end networks) across an IPv6 network.  If the IPv4 addresses of
   the end users are provisioned by the concentrator side, then the
   provisioning process should be able to cross the IPv6 network, too.
   One such tunnel mechanism is demonstrated in
   [I-D.ietf-softwire-public-4over6].  DHCPv4 over IPv6 would be a
   generic solution for this scenario.

   Three main flavours of solutions may be considered:

   o  Use DHCPv6 instead of DHCPv4, to provision IPv4-related
      connectivity.  In DHCPv6, the provisioned IPv4 address can be
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