Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!nwnexus!amc-gw!quick!srg
From: srg@quick.com (Spencer Garrett)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: When is a link saturated?
Message-ID: <1991Jan20.040130.18339@quick.com>
Date: 20 Jan 91 04:01:30 GMT
References: <9101150900.AA08526@jerry.inria.fr> <9101150724.AA12358@mcsun.EU.net> <24@prang.TEST.Vitalink.COM>
Organization: Quicksilver Engineering, Seattle USA
Lines: 9

-> I don't understand why the "remember the first exchange" is necessary. 
-> Both telnet and rlogin use a reserved port number that appears in either
-> the source or destination TCP port fields on *every* packet that is
-> routed for the entire session.

Alas, no.  A server is free to answer the connection request
with a different port number, and they commonly do.  (The reason
for this eludes me.  It is permitted by the RFC's, but not
required or particularly encouraged.)