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Date:      Thu, 10 Dec 1998 11:06:12 -0600 (CST)
From:      Mohit Aron <aron@cs.rice.edu>
To:        freebsd-bugs@FreeBSD.ORG
Subject:   T/TCP implementation
Message-ID:  <199812101706.LAA11488@noel.cs.rice.edu>

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Hi,
	I'm using FreeBSD-2.2.6. I'm running a TCP transfer between two
machines - one machine has T/TCP turned off while the other doesn't.
(I turned T/TCP off using command "sysctl -w net.inet.tcp.rfc1644=0"). The
problem is that even though the machine that has T/TCP turned off doesn't 
send any T/TCP specific options, it still receives these options in non-SYN
segments from the other machine. Moreover, it still processes the T/TCP 
specific options sent by the other machine. In a nutshell there are two 
problems:
	1) The machine where T/TCP is enabled shouldn't be sending T/TCP 
	   specific options in segments other than the initial SYN segment
	   as the corresponding SYN from the other end didn't contain any
	   such options.
	2) Even when T/TCP options are received on the machine where T/TCP 
	   is disabled, it should ignore them.



- Mohit

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