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From: cpw%sneezy@LANL.GOV (C. Philip Wood)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Help with broken TCP
Message-ID: <8709012028.AA21355@sneezy.lanl.gov>
Date: Tue, 1-Sep-87 16:28:54 EDT
Article-I.D.: sneezy.8709012028.AA21355
Posted: Tue Sep  1 16:28:54 1987
Date-Received: Sat, 5-Sep-87 04:44:53 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 12

4.3BSD network bug (#9, tcp_output) had a fix for an undetected data
loss during connection closing.  This may well have fixed the data loss
due to lost data segments, but, apparently it will cause the symptom
I reported if the data segment with FIN is lost.  If the test:

	if (flags & TH_FIN && tp->t_flags & TF_SENTFIN && len == 0)
	
succeeds the #9 code decremented tp->sndnxt by one.  Instead, I set
tp->snd_nxt = tp->snd_una, and the symptom went away.   I'm not saying
this is a fix, but it may point more to the problem.

Phil Wood  (cpw@lanl.gov)