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mptcp proxies Mark Handley

mptcp proxies Mark Handley. MPTCP Mobility. 3G celltower. Mobile client. Server. MPTCP Mobility. Mobile client. Server. Wifi. Wifi. MPTCP Mobility. Server. Mobile client. Wifi. Wifi. MPTCP Mobility. Server. Wifi. Mobile client. Wifi. MPTCP as a mobility solution.

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mptcp proxies Mark Handley

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  1. mptcp proxiesMark Handley

  2. MPTCP Mobility 3G celltower Mobile client Server

  3. MPTCP Mobility Mobile client Server Wifi Wifi

  4. MPTCP Mobility Server Mobile client Wifi Wifi

  5. MPTCP Mobility Server Wifi Mobile client Wifi

  6. MPTCP as a mobility solution Short paper: http://nrg.cs.ucl.ac.uk/mptcp/mobility.pdf Scenario: want to use variable quality 3G and intermittently available WiFi hotspots. • Preliminary results show we can achieve better throughput, more robustness, and save battery power.

  7. Need to be able to depend on MPTCP availability • Problem: • For the near future, most of the servers won’t support MPTCP. • Solution: • Perform MPTCP to a proxy.

  8. MPTCP Mobility: Legacy Server 3G MPTCP Proxy Mobile client Server MPTCP client sends SYN to proxy, indicating address of final server. Proxy initiates connection to server.

  9. MPTCP Mobility: Legacy Server 3G MPTCP Proxy Server New subflows are set up to the proxy, which load-balances in the normal MPTCP manner.

  10. MP_CAPABLE MP_CAPABLE MPTCP Mobility: MPTCP Server MPTCP Proxy P Mobile client MPTCP Server S

  11. MP_CAPABLE ADD_ADDR: S MP_CAPABLE MPTCP Mobility: MPTCP Server MPTCP Proxy P Mobile client MPTCP Server S Proxy knows server is MP_CAPABLE. Sends ADD_ADDR to tell client.

  12. MPTCP Mobility: MPTCP Server MPTCP Proxy P Mobile client MPTCP Server S Client sets up new subflow direct to server. Proxied path becomes backup - not used for data traffic

  13. MPTCP Mobility : MPTCP Server MPTCP Proxy P MPTCP Server S New subflows go direct to server.

  14. MPTCP Proxies • Proxies are TCP-level relays - no application semantics. • Protocol implication: • Need to indicate (preferably in SYN) the address of the server the proxy should connect to. • No other change needed. • Issue: space in SYN.

  15. mptcp congestion control

  16. draft-ietf-mptcp-congestion-0? • Full paper in NSDI 2011 (yesterday!) describes in detail the design and performance of the linked congestion control mechanism. • Draft updated to the version of the algorithm from the paper (previous draft had a bug - didn’t express what we actually implemented!).

  17. Congestion Control in the Data Center.Effect of a hotspot on different algorithms.

  18. MPTCP congestion control gives 3x improvement where multiple paths are available Nodes on same switch or same VM: only one path available Measured performance on Amazon’s EC2 data center.10 nodes, 3700 periodic pairwise transfers over 24 hours.

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