Enhanced Route Optimization for Mobile IPv6
RFC 4866

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Network Working Group                                           J. Arkko
Request for Comments: 4866                  Ericsson Research NomadicLab
Category: Standards Track                                        C. Vogt
                                             Universitaet Karlsruhe (TH)
                                                               W. Haddad
                                                       Ericsson Research
                                                                May 2007

              Enhanced Route Optimization for Mobile IPv6

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.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   This document specifies an enhanced version of Mobile IPv6 route
   optimization, providing lower handoff delays, increased security, and
   reduced signaling overhead.

Table of Contents

   1. Introduction ....................................................3
   2. Objectives ......................................................4
      2.1. Handoff Latency ............................................5
      2.2. Security ...................................................5
      2.3. Signaling Overhead .........................................7
   3. Protocol Design .................................................7
      3.1. Cryptographically Generated Home Addresses .................7
      3.2. Non-Cryptographic Care-of Addresses ........................8
      3.3. Semi-Permanent Security Associations .......................8
      3.4. Initial Home Address Tests .................................8
      3.5. Concurrent Care-of Address Tests ...........................9
      3.6. Credit-Based Authorization .................................9
      3.7. Parallel Home and Correspondent Registrations .............10
   4. Protocol Operation .............................................10
      4.1. Sending Binding Update Messages ...........................10
      4.2. Receiving Binding Update Messages .........................18
      4.3. Sending Binding Acknowledgment Messages ...................22

Arkko, et al.               Standards Track                     [Page 1]
RFC 4866              Enhanced Route Optimization               May 2007

      4.4. Receiving Binding Acknowledgment Messages .................23
      4.5. Sending CGA Parameters ....................................25
      4.6. Receiving CGA Parameters ..................................26
      4.7. Sending Permanent Home Keygen Tokens ......................27
      4.8. Receiving Permanent Home Keygen Tokens ....................28
      4.9. Renewing Permanent Home Keygen Tokens .....................28
      4.10. Handling Payload Packets .................................28
      4.11. Credit Aging .............................................31
      4.12. Simultaneous Movements ...................................32
   5. Option Formats and Status Codes ................................32
      5.1. CGA Parameters Option .....................................32
      5.2. Signature Option ..........................................33
      5.3. Permanent Home Keygen Token Option ........................34
      5.4. Care-of Test Init Option ..................................35
      5.5. Care-of Test Option .......................................35
      5.6. CGA Parameters Request Option .............................36
      5.7. Status Codes ..............................................36
   6. Security Considerations ........................................38
      6.1. Home Address Ownership ....................................39
      6.2. Care-of Address Ownership .................................41
      6.3. Credit-Based Authorization ................................43
      6.4. Time Shifting Attacks .....................................46
      6.5. Replay Attacks ............................................47
      6.6. Resource Exhaustion .......................................47
      6.7. IP Address Ownership of Correspondent Node ................47
   7. Protocol Constants and Configuration Variables .................49
   8. IANA Considerations ............................................50
   9. Acknowledgments ................................................50
   10. References ....................................................51
      10.1. Normative References .....................................51
      10.2. Informative References ...................................51

Arkko, et al.               Standards Track                     [Page 2]
RFC 4866              Enhanced Route Optimization               May 2007