The GP was talking about controlling both ends of the connection, I assumed that implied having root-level access to both ends. A scenario where you control bot

The GP was talking about controlling both ends of the connection, I assumed that implied having root-level access to both ends. A scenario where you control both ends but don't have full TCP/IP stack access on at least one side seems pretty academical. (But even then, just open lots of TCP connections if you want to have your unfair share of bandwidth)