From owner-freebsd-bugs  Fri Jul 14  8:50: 5 2000
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Date: Fri, 14 Jul 2000 08:50:02 -0700 (PDT)
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From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Subject: kern/19913: add SYN+FIN counter
Reply-To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
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The following reply was made to PR kern/19913; it has been noted by GNATS.

From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
To: hristo@spider.comnet.bg
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: kern/19913: add SYN+FIN counter
Date: Fri, 14 Jul 2000 11:40:32 -0400 (EDT)

 <<On Fri, 14 Jul 2000 11:29:21 +0300 (EEST), hristo@bginfo.net said:
 
 > As you know FreeBSD 4 has an option to drop SYN+FIN packets but it does
 > not has a counter of how much SYN+FIN packets were actually dropped. This
 > minor patch add sysctl variable to count them and have it for reference
 > when needed.
 
 The code that implements this `feature' is buggy.  It should not drop
 the packets, but rather, trim them back to just a SYN, as Solaris
 does.  (This potentially requires adjusting sequence numbers,
 depending on the contents of the packet.)  If implemented properly,
 there is no need for instrumentation.
 
 -GAWollman
 
 


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