> From: André Warnier [mailto:a...@ice-sa.com]
> I think I'll have to refresh my TCP knowledge base, to see if there is
> any byte somewhere in a TCP header specifying the internet protocol.
> But I don't think so.

Sort of :-).  The nearest you get is the four bytes specifying the source and 
destination port numbers - though as you already know that's subject to 
considerable latitude in interpretation!  In particular, if one of those values 
is a well-known port (http://www.iana.org/assignments/port-numbers), the 
corresponding protocol RFC-SHOULD* be in use....

                - Peter

* Acronym decoder for those who are about to complain: Internet Engineering 
Task Force (IETF) Requests for Comments (RFCs) frequently make use of MUST, 
SHOULD, MAY, SHOULD NOT or MUST NOT (capitalised in that way) to indicate how a 
"correct" system behaves.  This has entered some more general Internet 
parlance, so RFC-SHOULD can be taken to mean "SHOULD as defined in RFC 2119 
(http://www.ietf.org/rfc/rfc2119.txt)".

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