Reverse Tunneling for Mobile IP
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Auteur(s) :
Editor G. Montenegro
Classé sous :
Internet,
Protocol,
Agent,
Extensions,
Delivery,
Encapsulating,
Mobiliprev,
Home,
Foreign,
Style
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
Montenegro Standards Track [Page 1]