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From: mckee@MITRE.ARPA (H. Craig McKee)
Newsgroups: mod.protocols.tcp-ip
Subject: Re: Analyzing Acknowledgement Strategies, continued
Message-ID: <8701212056.AA18385@mitre.ARPA>
Date: Wed, 21-Jan-87 18:13:57 EST
Article-I.D.: mitre.8701212056.AA18385
Posted: Wed Jan 21 18:13:57 1987
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Concerning the design of a filter to estimate rtt - I think 
you're trying to do too much "within" TCP.  ICMP source quench messages
are a good indication of network congestion.  X.25 has a RNR (Receiver
Not Ready) indication that may also be useful.

Regards - Craig