hello, reviving this old topic. I've experimented a bit with the LD_PRELOAD thing. Looks like at least nginx and apache can be forced to use MPTCP instead of TCP with a crafted unit file created automatically from the distro- provided one. e.g. for nginx, adding: Conflicts=nginx.service After=nginx.service into the [unit] section, and: Environment="LD_PRELOAD=/usr/lib64/use_mptcp.so" ExecStartPre=sysctl -w net.mptcp.enabled=1 into the [Service] section. Then I had to fight a bit with selinux. I did not really investigate the issue, I think/fear selinux misunderstood mptcp sockets as raw ones, so default policy fails. A bunch of: ausearch -c 'nginx' --raw | audit2allow -M my-nginx semodule -i my-nginx.pp solved the problem. Bottom line: - the above looks tecnically viable [at least for some services]. I'm looking for a more extended service/daemon list to investigate fourther. I think we could/should really consider package the above in mptcpd or the like. - selinux (surprise, surprise!) can be a problem. Worth looking at it (that is independent from the system we will pick to force MPTCP socket usage) Cheers, Paolo