Mobile IPv6 Bootstrapping in Split Scenario
RFC 5026

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• 07

Network Working Group                                   G. Giaretta, Ed.
Request for Comments: 5026                                      Qualcomm
Category: Standards Track                                       J. Kempf
                                                         DoCoMo Labs USA
                                                     V. Devarapalli, Ed.
                                                         Azaire Networks
                                                            October 2007

              Mobile IPv6 Bootstrapping in Split Scenario

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

   A Mobile IPv6 node requires a Home Agent address, a home address, and
   IPsec security associations with its Home Agent before it can start
   utilizing Mobile IPv6 service.  RFC 3775 requires that some or all of
   these are statically configured.  This document defines how a Mobile
   IPv6 node can bootstrap this information from non-topological
   information and security credentials pre-configured on the Mobile
   Node.  The solution defined in this document solves the split
   scenario described in the Mobile IPv6 bootstrapping problem statement
   in RFC 4640.  The split scenario refers to the case where the Mobile
   Node's mobility service is authorized by a different service provider
   than basic network access.  The solution described in this document
   is also generically applicable to any bootstrapping case, since other
   scenarios are more specific realizations of the split scenario.

Giaretta, et al.            Standards Track                     [Page 1]
RFC 5026          MIP6 Bootstrapping in Split Scenario      October 2007

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................3
   3. Split Scenario ..................................................4
   4. Components of the Solution ......................................7
   5. Protocol Operations .............................................9
      5.1. Home Agent Address Discovery ...............................9
           5.1.1. DNS Lookup by Home Agent Name ......................10
           5.1.2. DNS Lookup by Service Name .........................10
      5.2. IPsec Security Associations Setup .........................11
      5.3. Home Address Assignment ...................................11
           5.3.1. Home Address Assignment by the Home Agent ..........11
           5.3.2. Home Address Auto-Configuration by the
                  Mobile Node ........................................12
      5.4. Authorization and Authentication with MSA .................14
   6. Home Address Registration in the DNS ...........................14
   7. Summary of Bootstrapping Protocol Flow .........................16
   8. Option and Attribute Format ....................................17
      8.1. DNS Update Mobility Option ................................17
      8.2. MIP6_HOME_PREFIX Attribute ................................19
   9. Security Considerations ........................................20
      9.1. HA Address Discovery ......................................20
      9.2. Home Address Assignment through IKEv2 .....................22
      9.3. SA Establishment Using EAP through IKEv2 ..................22
      9.4. Backend Security between the HA and AAA Server ............22
      9.5. Dynamic DNS Update ........................................23
   10. IANA Considerations ...........................................24
   11. Contributors ..................................................24
   12. Acknowledgements ..............................................25
   13. References ....................................................25
      13.1. Normative References .....................................25
      13.2. Informative References ...................................26

Giaretta, et al.            Standards Track                     [Page 2]
RFC 5026          MIP6 Bootstrapping in Split Scenario      October 2007

1.  Introduction

   Mobile IPv6 [1] requires the Mobile Node to know its Home Agent
   Address, its own Home Address, and the cryptographic materials (e.g.,
   shared keys or certificates) needed to set up IPsec security
   associations with the Home Agent (HA) in order to protect Mobile IPv6
   signaling.  This is generally referred to as the Mobile IPv6
   bootstrapping problem [7].

   The Mobile IPv6 base protocol does not specify any method to
   automatically acquire this information, which means that network