IP Mobility Support for IPv4, Revised
RFC 5944

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Internet Engineering Task Force (IETF)                   C. Perkins, Ed.
Request for Comments: 5944                                 WiChorus Inc.
Obsoletes: 3344                                            November 2010
Category: Standards Track
ISSN: 2070-1721

                 IP Mobility Support for IPv4, Revised

Abstract

   This document specifies protocol enhancements that allow transparent
   routing of IP datagrams to mobile nodes in the Internet.  Each mobile
   node is always identified by its home address, regardless of its
   current point of attachment to the Internet.  While situated away
   from its home, a mobile node is also associated with a care-of
   address, which provides information about its current point of
   attachment to the Internet.  The protocol provides for registering
   the care-of address with a home agent.  The home agent sends
   datagrams destined for the mobile node through a tunnel to the care-
   of address.  After arriving at the end of the tunnel, each datagram
   is then delivered to the mobile node.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5944.

Perkins                      Standards Track                    [Page 1]
RFC 5944                   IP Mobility Support             November 2010

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Perkins                      Standards Track                    [Page 2]
RFC 5944                   IP Mobility Support             November 2010

Table of Contents

   1. Introduction ....................................................5
      1.1. Protocol Requirements ......................................5
      1.2. Goals ......................................................6
      1.3. Assumptions ................................................6
      1.4. Applicability ..............................................6
      1.5. New Architectural Entities .................................7
      1.6. Terminology ................................................7
      1.7. Protocol Overview .........................................11
      1.8. Message Format and Protocol Extensibility .................14
      1.9. Type-Length-Value Extension Format for Mobile IP
           Extensions ................................................16
      1.10. Long Extension Format ....................................17
      1.11. Short Extension Format ...................................18
   2. Agent Discovery ................................................18
      2.1. Agent Advertisement .......................................19
           2.1.1. Mobility Agent Advertisement Extension .............21
           2.1.2. Prefix-Lengths Extension ...........................23
           2.1.3. One-Byte Padding Extension .........................24
      2.2. Agent Solicitation ........................................24
      2.3. Foreign Agent and Home Agent Considerations ...............24
           2.3.1. Advertised Router Addresses ........................26
           2.3.2. Sequence Numbers and Rollover Handling .............26