1. MSOCKS : An Architecture for Transport Layer Mobility David A. Maltz, Pravin Bhagwat IEEE INFOCOM 1998 Presented by Chiou-Jiun-Chao 2006/10/04

2. Outline Introduction MSOCKS Performance Conclusion

3. Introduction A flexible system that mobile nodes can continue connections between different interfaces.

4. MSOCKS architecture A proxy provides “ TCP Splice ” A MSOCKS library in mobile node

6. MSOCKS MSOCK library It intercepts calls made by application to networking functions such as connect(), send(), … Send out RECONNECT request Maintain variables: Data_read Date_written

7. Proxy Splice connections Specify each connection with one “ identifier ”. Identifier = one proxy port number. Mapping SeqNum. between two connections. Alter IP and TCP headers Choose the “ Basepint ” The first byte of new connection.

9. Basepoint choosen. Server  client flow : Read is slower

10. Server  Client : Read is faster

11. Client  Server :

12. Performance

13. Conclusion MSOCKS provides applications with different control over their sessions.