1. 1 Utilizing Multiple Home Links on Mobile IPv6 Waseda University Hongbo Shi shi@goto.info.waseda.ac.jpshi@goto.info.waseda.ac.jp Shigeki Goto goto@goto.info.waseda.ac.jpgoto@goto.info.waseda.ac.jp 3/23/2004

2. 2 Mobile IP Mobile IP (Mobility Support in IP) –Provides the mobility function on IP Layer How to realize the Mobile IP –Home Address: An IP address for a Mobile Node’s permanent use when the node is working as a mobility node. –Care-of Address An IP address for Mobile Node’s temporary use when the node is away from its Home Link. An IP address will be changed frequently while the node is changing its attached links.

3. 3 Triangle Routing in Mobile IPv4 Correspondent Node (CN) Mobile Node (MN) Home Agent (HA) Home Link Foreign Link Foreign Agent (FA)

4. 4 Route Optimization Correspondent Node (CN)Mobile Node (MN) Home Agent (HA) Home Link Foreign Link Default Router

5. 5 Multiple Home Agents Mechanism

6. 6

7. 7 Multiple Home Agent Mechanism (Cont’d)

8. 8 New Mobility Option Home Agent Address Field: Multiple Home Agents’ IP addresses

9. 9 ICMP Home Agent Unreachable Error Message

10. 10 Test Environment KAME + FreeBSD Function addition to KAME –Home Agents Selection: Select 2 home agents to support a mobile node –Binding Registration to multiple home agents Binding Updates to multiple home agents

11. 11 Testbed Home Agent 1 Home Agent 2 2001:200:1:1::2001:200:1:3:: ed1: 2001:200:1:2::1 wi0: 2001:200:1:1::2 fxp0: 2001:200:1:2::2 Foreign Link Home Link Mobile Node ed1: 2001:200:1:3:240:26ff:fe4c:51fd Foreign Link 2001:200:1:2::(IPv6 アドレス ) an0: 2001:200:1:1::3 ed1: 2001:200:1:3::1

12. 12 Lifetime: 420 seconds Expiration time:372 seconds Sequence number: 34285 Home Agent 1 IP address Mobile Node Home Address Mobile Node Care-of Address

13. 13 Sequence number: 34285+1=34286

14. 14 Lifetime: 420 seconds Expiration time:393 seconds Home Agent 2 IP address Mobile Node Home Address Mobile Node Care-of Address Sequence number: 10803

15. 15 Sequence number: 10803+1=10804

16. 16 Home Agent 2 IP address Home Agent 1 IP address Sequence Number: 34285 Mobile Node Home Address & Mobile Node Care-of Address Sequence Number: 10803

17. 17 Sequence Number: 34285+1=34286 Sequence Number: 10803+1=10804

18. 18 Multiple Home Links Mechanism

19. 19 Mechanism A non-multihoming mobile node can have multiple home links – multiple home agents on different links A mobile node can have more than 2 different home addresses A mobile node only has 1 care-of address, if it is not a multihoming node Multiple Home Links is an extension system of Multiple Home Agents

20. 20 How to work Allow a mobile node to have multiple home links -> a mobile node can have multiple home addresses at a time to a network interface A mobile node has to send binding update or binding registration messages to its home agents which are on the links that the mobile node is not attached. –Certainly even when a mobile node is just attached to one of its home links, the mobile node still needs to send binding update or registration messages to the other home agents on its different home links.

21. 21 ICMP Error Message ICMP Home Agent Unreachable Error

22. 22 Multiple Home Links Mechanism

23. 23 Correspondent Node (CN) Home Link 1 Home Link 2 Home Agent 3 Foreign Link Mobile Node (MN) Default Router Home Agent 2 Home Agent 1 (HA) Tunnel 1 Tunnel 2 Tunnel 3

24. 24 Correspondent Node (CN)Mobile Node (MN) Home Link 1 Home Link 2 Home Agent 3 Foreign Link Mobile Node Default Router Binding Update Home Registration Home Agent 2 Home Agent 1 (HA) Send Binding Update Message MN is on a Foreign Link

25. 25 Send Binding Update Message MN is on a Home Link Correspondent Node (CN) Mobile Node (MN) Home Link 1 Home Link 2 Home Agent 3 Binding Update Home Registration Home Agent 2 Home Agent 1 (HA)

26. 26 Home Agent 1 Home Agent 2 2001:200:1:3::/64 ed1: 2001:200:1:3::1 an0: 2001:200:1:2::1 fxp0: 2001:200:1:3::2 Foreign Link Home Link 1 Mobile Node hif0 (Home Addresses): 2001:200:1:2:207:85ff:fe92:532c 2001:200:1:4:207:85ff:fe92:532c an0 (Care-of Address): 2001:200:1:3:207:85ff:fe92:532c 2001:200:1:4::/64 an0: 2001:200:1:2::2 Home Agent 3 2001:200:1:2::/64 Home Link 2 Foreign Link 2001:200:1:6::/64 r11: 2001:200:1:4::1 r10: 2001:200:1:3::3 fxp0: 2001:200:1:6::1

27. 27 Remaining Issues and Future Plan How to share a mobile node’s binding information among home agents How to cross-refer the home addresses of a mobile node