1. DESIGNS AND ANALYSIS OF LOCAL MOBILITY AGENTS DISCOVERY, SELECTION AND FAILURE DETECTION FOR MOBILE IPV6 VRIZLYNN L.L. THING, HENRY C.J.LEE, YI XU IEEE 2002 presented by 徐建鈞

2. Outline Introduction Hierarchical Mobile IPV6(HMIPV6) LMM Design Proposals Future Work Reference

3. Introduction The imminent proliferation of mobile devices is pushing forth the need for mobility support to facilitate the roaming of mobile devices. LMA(Local Mobility Agent) to act as a local HA.

4. Hierarchical Mobile IPV6(HMIPV6) The routers are arranged in a hierarchical structure Two methods are proposed to discover the furthest MAP to register with Dynamic MAP Discovery method Router Renumbering method Prefix Code Operation(PCO), PROPAGATE

5. Hierarchical Mobile IPV6(cont.) Based on the concept of tree topology where the MAP advertisement are propagated from a central node to the MN

6. Hierarchical Mobile IPV6(cont.)

7. LMM Design Proposals 1. Route Tracing 2. En-Route LMAs Recording 3. Hop-By-Hop LMA Probing

8. LMM Design Proposals(cont.) Route Tracing ICMP Echo request packet to HA Intermediate nodes will send ICMP Time Exceeded packets to MN HA will mark the end of the route tracing process

9. LMM Design Proposals(cont.) Route Tracing

10. LMM Design Proposals(cont.) En-Route LMAs Recording Hop-by-Hop Option called the “ Record LMAs ” Intermediate LMAs append their IP address to the record Finally HA sends ICMP Echo reply packet to the MN

11. LMM Design Proposals(cont.) En-Route LMAs Recording

12. LMM Design Proposals(cont.) Hop-By-Hop LMA Probing New hop-by-hop option LMA Probe Option New ICMPv6 Informational Message LMA Probe Reply LMA Configuration LMA Configuration Acknowledgement LMA Alive Notification

13. LMM Design Proposals(cont.) Hop-By-Hop LMA Probing LMA Probe Option Fields

14. LMM Design Proposals(cont.) Hop-By-Hop LMA Probing DGEI(Domain Gateway External Interface) is indicated by 0 Boundary Encountered

15. LMM Design Proposals(cont.) Hop-By-Hop LMA Probing

16. LMM Design Proposals(cont.) Hop-By-Hop LMA Probing

17. LMM Design Proposals(cont.) Hop-By-Hop LMA Probing

18. LMM Design Proposals(cont.) Hop-By-Hop LMA Probing

19. Future Work Amount of additional signaling traffic, latency and packet loss of each method will need to be further analyzed Simulations would be performed at a later stage to obtain these information

20. References