Candidate Access Router Discovery (CARD)
RFC 4066
Document | Type | RFC - Experimental (July 2005; No errata) | |
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Authors | Ajoy Singh , Hemant Chaskar , E Shim , Marco Liebsch , Daichi Funato | ||
Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4066 (Experimental) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Allison Mankin | ||
Send notices to | (None) |
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 of candidate access routers (CARs) to which a mobile node can be transferred. The CAR discovery protocol enables the acquisition of information about the access routers that are candidates for theShow full document text