Caitlin> It's basically the same as with TCP and UDP. It's a 16
    Caitlin> bit number, and most people do not use the same port
    Caitlin> number to mean *different* things over the different IP
    Caitlin> transports.

But, just to be clear, the port number spaces are disjoint.  It's
possible and valid to have one TCP socket bound to a given IP/port
number, and another UDP socket bound to the same IP/port number.

I do agree that assigned port numbers generally have the same meaning
across all transports.  For example, both TCP port 111 and UDP port
111 are the sunrpc portmapper.

 - R.
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