Very nice intro into this important protocol. Anyone who is interested in QUIC, reading on MPTCP can help in understanding some of the "why"in the protocol (well, I'm still far away from understanding ... ;-) ). An interesting read on MPTCP is Geoff Hustons article in the 06/2015 IPJ: http://ipj.dreamhosters.com/wp-content/uploads/issues/2015/ipj18-2.pdf