[e2e] overlay over TCP

[David P. Reed]

The reason not to depend on SCTP is the same reason that UDP isn't 
adequate.   The social (non-technical) processes of the "internet 
community" have labeled anything non-TCP as POISON, KEEP OUT.
We have middleboxes and routers that chuck stuff like that on the floor.

Interop is about allowing everything not explicitly prohibited, but 
don't tell that to the "corporate IT" folks, who want to give you 
freedom from pesky things like ways to do your job better...  some jerk 
with a beard and a technical education knows how and when you should 
communicate, and he will let you know what communications technology you 
will be allowed to use.   Cisco's firewall division tells him what's OK, 
and God (or TPC from the President's Analyst) tells Cisco.