Author here. It was fun trying to actually use MPTCP. There aren't many resources on how to actually run it and what to expect. There are many unpolished aspects, like I was able to find (and report) a bug in MacOS (which has been fixed since then).
MPTCP promises a lot, and when it works, it's pretty cool. However, I think that QUIC might out-innovate it. Time will tell.
How do IP address changes actually work? I see how subflows could come and go, but doesn't the master MPTCP connection need fixed IP addresses?
From the blog, Does it mean MCTCP is not available on Windows, and Android?
Correct. No mptcp on windows and android as of 2024