> Baerts said, so there will be no user-space access to subflows for now. So one has to tcpdump to observe the sub flows? > But, naturally, there are users wh

> Baerts said, so there will be no user-space access to subflows for now. So one has to tcpdump to observe the sub flows? > But, naturally, there are users who want their unmodified binary programs to start using MPTCP once it's available. There is a working, if inelegant, solution to this problem. A new control-group hook allows the installation of a BPF program that runs when a program calls socket(); it can change the requested protocol to IPPROTO_MPTCP and the calling application will be none the wiser. Uhhhhh!