Registration Revocation in Mobile IPv4
RFC 3543

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Network Working Group                                           S. Glass
Request for Comments: 3543                              Sun Microsystems
Category: Standards Track                                     M. Chandra
                                                           Cisco Systems
                                                             August 2003

                 Registration Revocation in Mobile IPv4

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 Internet Society (2003).  All Rights Reserved.

Abstract

   This document defines a Mobile IPv4 Registration Revocation mechanism
   whereby a mobility agent involved in providing Mobile IP services to
   a mobile node can notify the other mobility agent providing Mobile IP
   services to the same mobile node of the termination of this
   registration.  The mechanism is also usable by a home agent to notify
   a co-located mobile node of the termination of its binding as well.
   Moreover, the mechanism provides for this notification to be
   acknowledged.  A signaling mechanism already defined by the Mobile
   IPv4 protocol is leveraged as a way to inform a mobile node of the
   revocation of its binding.

Table of Contents

   1.  Introduction and Applicability . . . . . . . . . . . . . . . .  2
   2.  Terminology. . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Registration Revocation Extensions and Messages. . . . . . . .  4
       3.1.  Advertising Registration Revocation Support. . . . . . .  5
       3.2.  Revocation Support Extension . . . . . . . . . . . . . .  6
       3.3.  Registration Revocation Message. . . . . . . . . . . . .  8
       3.4.  Registration Revocation Acknowledgment Message . . . . . 11
       3.5.  Replay Protection. . . . . . . . . . . . . . . . . . . . 14
   4.  Registration Revocation Overview . . . . . . . . . . . . . . . 15
       4.1.  Mobile Node Notification . . . . . . . . . . . . . . . . 15
       4.2.  Registration Revocation Mechanism - Agent Notification . 17
             4.2.1.  Negotiating Revocation Support . . . . . . . . . 17

Glass & Chandra             Standards Track                     [Page 1]
RFC 3543         Registration Revocation in Mobile IPv4      August 2003

             4.2.2.  Home Domain Revoking a Registration. . . . . . . 19
                     4.2.2.1.  Home Agent Responsibilities. . . . . . 19
                     4.2.2.2.  Foreign Agent Responsibilities . . . . 20
                     4.2.2.3.  'Direct' Co-located Mobile Node
                               Responsibilities . . . . . . . . . . . 20
             4.2.3.  Foreign Domain Revoking a Registration . . . . . 21
                     4.2.3.1.  Foreign Agent Responsibilities . . . . 21
                     4.2.3.2.  Home Agent Responsibilities. . . . . . 22
             4.2.4.  Mobile Node Deregistering a Registration . . . . 23
       4.3.  Mobile IP Registration Bits in the Revocation Process. . 23
             4.3.1.  The 'R' Bit in Use . . . . . . . . . . . . . . . 23
             4.3.2.  The 'D' Bit in Use (co-located mobile nodes) . . 23
   5.  Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . 24
   6.  Security Considerations. . . . . . . . . . . . . . . . . . . . 24
       6.1.  Agent Advertisements . . . . . . . . . . . . . . . . . . 24
       6.2.  Revocation Messages. . . . . . . . . . . . . . . . . . . 25
   7.  IANA Considerations. . . . . . . . . . . . . . . . . . . . . . 27
       7.1.  New Message Types. . . . . . . . . . . . . . . . . . . . 27
       7.2.  New Extension Values . . . . . . . . . . . . . . . . . . 27
       7.3.  New Error Codes. . . . . . . . . . . . . . . . . . . . . 27
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 27
       8.1.  Normative (Numerical References) . . . . . . . . . . . . 27
       8.2.  Informational (Alphabetical References). . . . . . . . . 28
   Appendix A  An Example of the New Messages in Use. . . . . . . . . 29
               A.1.  The Registration Phase . . . . . . . . . . . . . 29
               A.2.  The Revocation Phase . . . . . . . . . . . . . . 29
   Appendix B  Disparate Address, and Receiver Considerations . . . . 30
   Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . . . 32
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 32
   Full Copyright Statement . . . . . . . . . . . . . . . . . . . . . 33

1.  Introduction and Applicability

   Mobile IP [1] defines registration of a mobile node's location to
   provide connectivity between the mobile node and its home domain,
   facilitating communication between mobile nodes and any correspondent