The document summarizes the SMesh architecture, an inter-domain routing protocol for multi-homed wireless mesh networks. SMesh allows clients to seamlessly handoff between multiple internet gateways while maintaining connections. It uses a private address space with NAT and routes each connection through the gateway it was established through. For TCP, it routes the initial SYN packet, while for UDP it routes packets to both the destination and gateways until an owner is determined. Experimental results show low latency and packet loss for both client-internet and peer-to-peer communication under the SMesh architecture.

1. An Inter-domain Routing Protocol for Multi-homed Wireless Mesh Networks Yair Amir, Claudiu Danilov, Raluca Musaloiu-E., Nilo Rivera Distributed Systems and Networks Lab The Johns Hopkins University June 19, 2007, IEEE WoWMoM

6. The SMesh Architecture

7. Intra -domain Handoff Internet http://smesh.org [MobiSys 2006]

9. Routing Approach Client 10.1.2.3 Multicast Control Group 224.1.2.3 Multicast Data Group 225.1.2.3 NAT Internet

10. Multi-homed Environment

14. TCP Inter-domain Handoff TCP SYN TCP DATA New TCP Connection 206.46.230.0 / 24 (Verizon) 204.127.205.8.0 / 24 (Comcast) Internet Client A 10.1.2.3

18. Inter-domain Handoff Flow Chart

19. Experimental Results

21. Client-Internet: Latency Client Internet Internet Client

22. Client-Internet: Lost Packets Client Internet 40 / 15,000 Internet Client 50 / 15,000

23. Client-Internet: Duplicate Packets Client Internet

24. P2P: Latency Client B Client A Client A Client B

25. P2P: Lost Packets Client B Client A 84 / 15,000 Client A Client B 92 / 15,000

26. Non-Owner Internet Gateway Failover TCP Stream Owner Gateway Internet

27. http://smesh.org

29. Questions?