DHCP Options for Home Information Discovery in MIPv6
draft-ietf-mip6-hiopt-17

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MIP6 Working Group                                               H. Jang
Internet-Draft                                                  A. Yegin
Intended status: Standards Track                                 Samsung
Expires: November 23, 2008                                  K. Chowdhury
                                                        Starent Networks
                                                                 J. Choi
                                                                 Samsung
                                                            May 22, 2008

          DHCP Options for Home Information Discovery in MIPv6
                      draft-ietf-mip6-hiopt-17.txt

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Jang, et al.            Expires November 23, 2008               [Page 1]
Internet-Draft   DHCPv6 for Home Info Discovery in MIPv6        May 2008

Abstract

   This draft defines a DHCP-based scheme to enable dynamic discovery of
   Mobile IPv6 home network information.  New DHCP options are defined
   which allow a mobile node to request the home agent IP address, FQDN,
   or home network prefix and obtain it via the DHCP response.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  DHCP options for HA Dynamic Discovery  . . . . . . . . . . . .  5
     3.1.  Home Network Information Option  . . . . . . . . . . . . .  5
     3.2.  MIP6 Relay Agent Option  . . . . . . . . . . . . . . . . .  7
     3.3.  Common Sub-options . . . . . . . . . . . . . . . . . . . .  8
   4.  Option Usage . . . . . . . . . . . . . . . . . . . . . . . . . 11
     4.1.  Mobile Node Behavior . . . . . . . . . . . . . . . . . . . 11
     4.2.  NAS/DHCP Relay Agent Behavior  . . . . . . . . . . . . . . 12
     4.3.  DHCP Server Behavior . . . . . . . . . . . . . . . . . . . 13
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17
   6.  IANA Consideration . . . . . . . . . . . . . . . . . . . . . . 18
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 19
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 20
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 21
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 22
   Intellectual Property and Copyright Statements . . . . . . . . . . 23

Jang, et al.            Expires November 23, 2008               [Page 2]
Internet-Draft   DHCPv6 for Home Info Discovery in MIPv6        May 2008

1.  Introduction

   Before a mobile node can engage in Mobile IPv6 signaling with a home
   agent, it should either know the IP address of the home agent via
   pre-configuration, or dynamically discover it.  The Mobile IPv6
   specification [RFC3775] describes how home agents can be dynamically
   discovered by mobile nodes that know the home network prefix.  This
   scheme does not work when prefix information is not already available
   to the mobile node.  One architecture to solve this problem is
   described in [I-D.ietf-mip6-bootstrapping-integrated-dhc].  This
   document specifies extensions to stateless DHCPv6 [RFC3736] [RFC3315]
   to deliver the home agent information to the mobile node in the form
   of the IP address of the home agent or the FQDN of the home agent.
   The information delivered to the mobile node may also include the
   home prefix for the mobile node.  The solution involves defining a
   new DHCP option to carry home network prefix, home agent IP address
   and FQDN information.  The mobile node MAY also use the home prefix
   to discover the list of home agents serving the home prefix using the
   Dynamic Home Agent Address Discovery mechanism specified in
   [RFC3775].

   As part of configuring the initial TCP/IP parameters, a mobile node