Just wondering whether you require both server serving the content and client are to be on a linux kernel with mptcp enabled?
I've read through some articles and they seem to be using a token/connection ID which I presume regular TCP doesn't do. So if that's the case then both server/client need to be on MPTCP isn't it? Or Have I missed something?
Yes, both - client and server - need to support MPTCP.
As you said, MPTCP changes the wire format of TCP by adding new TCP options.
Yes both of them need to have the same to support multi-path. If any of them (client or server) does not have then they act as a regular TCP flow. Mainly, at the beginning of the connection, the (3-way handshake) both of them exchange the information (MP_CAPABLE) that is it possible or not. If possible then the socket Establishes another flow which is mainly done by Path Manager. For more details (https://www.rfc-editor.org/rfc/rfc6824) Though this question is asked almost 3 years ago, maybe it would be helpful for others now.
