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Date:      Mon, 2 Feb 1998 10:10:25 +0100
To:        freebsd-hackers@FreeBSD.ORG
Subject:   help with real time monitoring of TCP control variables
Message-ID:  <"1268 98/02/02 10:10*/G=Igor/S=Alekseev/OU=kjeller/O=fou/PRMD=telenor/ADMD=TELEMAX/C=no/"@MHS>

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I am doing network performance evaluations with FreeBSD 2.2.5 with ENI ATM 
card, using HARP atm software. 

Is it possible to do the real time monitoring (by real time I mean synchronised with 
tcpdump output) of TCP connection control variables for a particular connection, 
such as SND.NXT, CWND, SSTHRESH, RTT estimate? Is there a standard 
mechanism for doing this kind of thing or is some source code change required of 
tcp code? In any case, could anyone, please give me a hint on the best way to do 
What I need - is basically dumping the above variables into a file along with 
timestamp, say every time a segment is received or sent. It does not have to be 
anything extremely versatile, just quick and easy hack will suffice for the time being.

By looking at the archives of this list, I found that such discussion was held 2.5 years 
ago, but I did not find any definite answer to the question posed. Maybe things have 
changed since then?

Thanks in advance, 

Igor V. Alekseev

Visiting reseacher, Telenor, Norway

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