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DHCPv6 Prefix Delegation for Network Mobility (NEMO)
RFC 6276

Internet Engineering Task Force (IETF)                          R. Droms
Request for Comments: 6276                                    P. Thubert
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                                F. Dupont
                                             Internet Systems Consortium
                                                               W. Haddad
                                                                Ericsson
                                                            C. Bernardos
                                                                    UC3M
                                                               July 2011

          DHCPv6 Prefix Delegation for Network Mobility (NEMO)

Abstract

   One aspect of network mobility support is the assignment of a prefix
   or prefixes to a mobile router for use on the links in the mobile
   network.  This document specifies how DHCPv6 prefix delegation can be
   used for this configuration task.  The mobile router plays the role
   of requesting router, while the home agent assumes the role of
   delegating router.  When the mobile router is outside its home
   network, the mobile router also assumes the role of DHCPv6 relay
   agent, co-located with the requesting router function.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc6276.

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
   publication of this document.  Please review these documents

Droms, et al.                Standards Track                    [Page 1]
RFC 6276            DHCPv6 Prefix Delegation for NEMO          July 2011

   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 . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  DHCPv6 Prefix Delegation of Mobile Network Prefixes  . . . . .  4
     3.1.  Exchanging DHCPv6 Messages When the Mobile Router Is
           Not at Home  . . . . . . . . . . . . . . . . . . . . . . .  5
       3.1.1.  Relay Agent Configuration  . . . . . . . . . . . . . .  7
       3.1.2.  Transmission of DHCPv6 Messages  . . . . . . . . . . .  8
       3.1.3.  Receipt of DHCPv6 Messages . . . . . . . . . . . . . .  8
     3.2.  Exchanging DHCPv6 Messages When the Mobile Router Is
           at Home  . . . . . . . . . . . . . . . . . . . . . . . . .  8
     3.3.  Selecting a Home Agent That Provides DHCPv6PD  . . . . . .  9
     3.4.  Minimizing DHCPv6PD Messages . . . . . . . . . . . . . . . 10
     3.5.  Other DHCPv6 Functions . . . . . . . . . . . . . . . . . . 10
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   5.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 12
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     6.1.  Normative References . . . . . . . . . . . . . . . . . . . 12
     6.2.  Informative References . . . . . . . . . . . . . . . . . . 13

1.  Introduction

   One aspect of network mobility support is the assignment of a prefix
   or prefixes to a mobile router for use on the links in Network
   Mobility (NEMO).  DHCPv6 prefix delegation (DHCPv6PD) [RFC3633] can
   be used for this configuration task.

   The model of operation of DHCPv6PD for prefix delegation is as
   follows [RFC3633].  A delegating router is provided IPv6 prefixes to
   be delegated to requesting routers.  A requesting router requests
   prefix(es) from the delegating router.  The delegating router chooses
   prefix(es) for delegation, and responds with prefix(es) to the
   requesting router.  The requesting router is then responsible for the
   delegated prefix(es).  Note that DHCPv6 options for prefix delegation

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