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Reverse Tunneling for Mobile IP (RFC2344)

IP.com Disclosure Number: IPCOM000002913D
Original Publication Date: 1998-May-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 16 page(s) / 37K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Montenegro: AUTHOR

Abstract

Mobile IP uses tunneling from the home agent to the mobile node's care-of address, but rarely in the reverse direction. Usually, a mobile node sends its packets through a router on the foreign network, and assumes that routing is independent of source address. When this assumption is not true, it is convenient to establish a topologically correct reverse tunnel from the care-of address to the home agent.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 8% of the total text.

Network Working Group G. Montenegro, Editor

Request for Comments: 2344 Sun Microsystems, Inc.

Category: Standards Track May 1998

Reverse Tunneling for Mobile IP

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 (1998). All Rights Reserved.

Abstract

Mobile IP uses tunneling from the home agent to the mobile node's

care-of address, but rarely in the reverse direction. Usually, a

mobile node sends its packets through a router on the foreign

network, and assumes that routing is independent of source address.

When this assumption is not true, it is convenient to establish a

topologically correct reverse tunnel from the care-of address to the

home agent.

This document proposes backwards-compatible extensions to Mobile IP

in order to support topologically correct reverse tunnels. This

document does not attempt to solve the problems posed by firewalls

located between the home agent and the mobile node's care-of address.

Table of Contents

1. Introduction ................................................ 2

1.1. Terminology ............................................... 3

1.2. Assumptions ............................................... 4

1.3. Justification ............................................. 4

2. Overview .................................................... 4

3. New Packet Formats .......................................... 5

3.1. Mobility Agent Advertisement Extension .................... 5

3.2. Registration Request ...................................... 5

3.3. Encapsulating Delivery Style Extension .................... 6

3.4. New Registration Reply Codes .............................. 7

4. Changes in Protocol Behavior ................................ 8

4.1. Mobile Node Considerations ................................ 8

4.1.1. Sending Registration Requests to the Foreign Agent ...... 8

4.1.2. Receiving Registration Replies from the Foreign Agent ... 9

4.2. Foreign Agent Considerations .............................. 9

4.2.1. Receiving Registration Requests from the Mobile Node ... 10

4.2.2. Relaying Registration Requests to the Home Agent ....... 10

4.3. Home Agent Considerations ................................ 10

4.3.1. Receiving Registration Requests from the Foreign Agent . 11

4.3.2. Sending Registration Replies to the Foreign Agent ...... 11

5. Mobile Node to Foreign Agent Delivery Styles ............... 12

5.1. Direct Delivery Style .......................................