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IP Mobility Support for IPv4 (RFC3220)

IP.com Disclosure Number: IPCOM000006865D
Original Publication Date: 2002-Jan-01
Included in the Prior Art Database: 2002-Feb-07

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Perkins: AUTHOR [+2]

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.

This text was extracted from an ASCII text file.
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Network Working Group                                    C. Perkins, Ed.

Request for Comments: 3220                         Nokia Research Center

Obsoletes: 2002                                             January 2002

Category: Standards Track

                      IP Mobility Support for 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 (2002).  All Rights Reserved.

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.

Contents

   1. Introduction                                                     3

       1.1. Protocol Requirements . . . . . . . . . . . . . . . . .    4

       1.2. Goals . . . . . . . . . . . . . . . . . . . . . . . . .    4

       1.3. Assumptions . . . . . . . . . . . . . . . . . . . . . .    5

       1.4. Applicability . . . . . . . . . . . . . . . . . . . . .    5

       1.5. New Architectural Entities  . . . . . . . . . . . . . .    5

       1.6. Terminology . . . . . . . . . . . . . . . . . . . . . .    6

       1.7. Protocol Overview . . . . . . . . . . . . . . . . . . .    9

       1.8. Message Format and Protocol Extensibility . . . . . . .   13

       1.9. Type-Length-Value Extension Format for Mobile IP

               Extensions . . . . . . . . . . . . . . . . . . . . .   15

      1.10. Long Extension Format . . . . . . . . . . . . . . . . .   16

Perkins                     Standards Track                     [Page 1]

RFC 3220              IP Mobility Support for IPv4          January 2002

      1.11. Short Extension Format  . . . . . . . . . . . . . . . .   16

   2. Agent Discovery                                                 17

       2.1. Agent Advertisement . . . . . . . . . . . . . . . . . .   18

             2.1.1. Mobility Agent Advertisement Extension  . . . .   20

             2.1.2. Prefix-Lengths Extension  . . . . . . . . . . .   22

             2.1.3. One-byte Padding Extension  . . . . . . . . . .   22

       2.2. Agent Solicitation  . . . . . . . . . . . . . . . . . .   23

       2.3. Foreign Agent and Home Agent Considerations . . . . . .   23

             2.3.1. Advertised Router Addresses . . . . . . . . . .   24

             2.3.2. Sequence Numbers and Rollover Handling  . . . .   24

       2.4. Mobile Node Considerations  . . . . . . . . . . . . . .   25

             2.4.1. Registration Required . . . . . . . . . . . . .   26

             2.4.2. Move Detection  . . . . . . . . . . . . . . . .   26

             2.4.3. Returning Home  . . . . . . . . . . . . . . . .   27

             2.4.4. Sequence Numbers and Rollover Handling  . . . .   28

   3. Registration                                                    28

       3.1. Registration Ove...