Candidate Access Router Discovery (CARD)
RFC 4066
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RFC - Experimental
(July 2005; No errata)
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Last updated |
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2015-10-14
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IETF
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plain text
pdf
html
bibtex
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WG state
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(None)
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Document shepherd |
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No shepherd assigned
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IESG state |
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RFC 4066 (Experimental)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Allison Mankin
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(None)
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Network Working Group M. Liebsch, Ed.
Request for Comments: 4066 A. Singh, Ed.
Category: Experimental H. Chaskar
D. Funato
E. Shim
July 2005
Candidate Access Router Discovery (CARD)
Status of This Memo
This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
To enable seamless IP-layer handover of a mobile node (MN) from one
access router (AR) to another, the MN is required to discover the
identities and capabilities of candidate ARs (CARs) for handover
prior to the initiation of the handover. The act of discovery of
CARs has two aspects: identifying the IP addresses of the CARs and
finding their capabilities. This process is called "candidate access
router discovery" (CARD). At the time of IP-layer handover, the CAR,
whose capabilities are a good match to the preferences of the MN, is
chosen as the target AR for handover. The protocol described in this
document allows a mobile node to perform CARD.
Table of Contents
1. Introduction.................................................. 2
2. Terminology................................................... 3
3. CARD Protocol Functions....................................... 4
3.1. Reverse Address Translation............................. 4
3.2. Discovery of CAR Capabilities........................... 4
4. CARD Protocol Operation....................................... 4
4.1. Conceptual Data Structures.............................. 7
4.2. Mobile Node - Access Router Operation................... 8
4.3. Current Access Router - Candidate Access Router
Operation............................................... 11
4.4. CARD Protocol Message Piggybacking on the MN-AR
Interface............................................... 13
Liebsch, et al. Experimental [Page 1]
RFC 4066 Candidate Access Router Discovery (CARD) July 2005
5. Protocol Messages............................................. 14
5.1. CARD Messages for the Mobile Node-Access Router
Interface............................................... 14
5.2. CARD Inter-Access Router Messages....................... 28
6. Security Considerations....................................... 31
6.1. Veracity of CARD Information............................ 31
6.2. Security Association between AR and AR.................. 31
6.3. Security Association between AR and MN.................. 32
6.4. Router Certificate Exchange............................. 32
6.5. DoS Attack.............................................. 34
6.6. Replay Attacks.......................................... 34
7. Protocol Constants............................................ 34
8. IANA Considerations........................................... 35
9. Normative References.......................................... 35
10. Informative References........................................ 35
11. Contributors.................................................. 36
12. Acknowledgements.............................................. 36
Appendix A. Maintenance of Address Mapping Tables in
Access Routers....................................... 37
Appendix A.1. Centralized Approach Using a Server Functional
Entity.......................................... 37
Appendix A.2. Decentralized Approach Using Mobile Terminals'
Handover........................................ 38
Appendix B. Application Scenarios................................ 40
Appendix B.1. CARD Operation in a Mobile IPv6-Enabled Wireless
LAN Network..................................... 40
Appendix B.2. CARD Operation in a Fast Mobile IPv6-Enabled
Network......................................... 43
1. Introduction
IP mobility protocols, such as Mobile IP, enable mobile nodes to
execute IP-level handover among access routers. Work is underway
[Kood03][Malk03] to extend the mobility protocols to allow seamless
IP handover. Seamless IP mobility protocols will require knowledge
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