Hierarchical Mobile IPv6 Mobility Management (HMIPv6)
RFC 4140

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Network Working Group                                         H. Soliman
Request for Comments: 4140                                       Flarion
Category: Experimental                                   C. Castelluccia
                                                                   INRIA
                                                             K. El Malki
                                                                Ericsson
                                                              L. Bellier
                                                                   INRIA
                                                             August 2005

         Hierarchical Mobile IPv6 Mobility Management (HMIPv6)

Status of This Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document introduces extensions to Mobile IPv6 and IPv6 Neighbour
   Discovery to allow for local mobility handling.  Hierarchical
   mobility management for Mobile IPv6 is designed to reduce the amount
   of signalling between the Mobile Node, its Correspondent Nodes, and
   its Home Agent.  The Mobility Anchor Point (MAP) described in this
   document can also be used to improve the performance of Mobile IPv6
   in terms of handover speed.

Soliman, et al.               Experimental                      [Page 1]
RFC 4140                         HMIPv6                      August 2005

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. Overview of HMIPv6 ..............................................5
      3.1. HMIPv6 Operation ...........................................6
   4. Mobile IPv6 Extensions ..........................................8
      4.1. Local Binding Update .......................................8
   5. Neighbour Discovery Extension: The MAP Option Message Format ....9
   6. Protocol Operation .............................................10
      6.1. Mobile Node Operation .....................................10
           6.1.1. Sending Packets to Correspondent Nodes .............12
      6.2. MAP Operations ............................................12
      6.3. Home Agent Operations .....................................13
      6.4. Correspondent Node Operations .............................13
      6.5. Local Mobility Management Optimisation within a
           MAP Domain ................................................13
      6.6. Location Privacy ..........................................14
   7. MAP Discovery ..................................................14
      7.1. Dynamic MAP Discovery .....................................14
           7.1.1. Router Operation for Dynamic MAP Discovery .........15
           7.1.2. MAP Operation for Dynamic MAP Discovery ............15
      7.2. Mobile Node Operation .....................................16
   8. Updating Previous MAPs .........................................16
   9. Notes on MAP Selection by the Mobile Node ......................17
      9.1. MAP Selection in a Distributed-MAP Environment ............17
      9.2. MAP Selection in a Flat Mobility Management Architecture ..19
   10. Detection and Recovery from MAP Failures ......................19
   11. IANA Considerations ...........................................20
   12. Security Considerations .......................................20
       12.1. Mobile Node-MAP Security ................................20
       12.2. Mobile Node-Correspondent Node Security .................22
       12.3. Mobile Node-Home Agent Security .........................22
   13. Acknowledgments ...............................................22
   14. References ....................................................23
       14.1. Normative References ....................................23
       14.2. Informative References ..................................23
   Appendix A: Fast Mobile IPv6 Handovers and HMIPv6 .................24

Soliman, et al.               Experimental                      [Page 2]
RFC 4140                         HMIPv6                      August 2005

1.  Introduction

   This memo introduces the concept of a Hierarchical Mobile IPv6
   network, utilising a new node called the Mobility Anchor Point (MAP).

   Mobile IPv6 [1] allows nodes to move within the Internet topology
   while maintaining reachability and on-going connections between
   mobile and correspondent nodes.  To do this a mobile node sends
   Binding Updates (BUs) to its Home Agent (HA) and all Correspondent
   Nodes (CNs) it communicates with, every time it moves.
   Authenticating binding updates requires approximately 1.5 round-trip