mptcp proxies Mark Handley

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Presentation transcript:

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 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.

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.

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

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

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

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

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

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

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.