kern/190102: [tcp] net.inet.tcp.drop_synfin=1 no longer works on FreeBSD 10+ [regression]

Eygene Ryabinkin rea at
Thu May 29 08:10:01 UTC 2014

The following reply was made to PR kern/190102; it has been noted by GNATS.

From: Eygene Ryabinkin <rea at>
To: hiren panchasara <hiren.panchasara at>
Cc: "freebsd-net at" <freebsd-net at>,
	FreeBSD GNATS followup <bug-followup at>
Subject: Re: kern/190102: [tcp] net.inet.tcp.drop_synfin=1 no longer works on
 FreeBSD 10+ [regression]
Date: Thu, 29 May 2014 12:00:05 +0400

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 Wed, May 28, 2014 at 11:52:51PM -0700, hiren panchasara wrote:
 > On Wed, May 28, 2014 at 10:46 PM, Eygene Ryabinkin <rea at> wrot=
 > > I assume that your pf(4) is enabled during these tests, you have
 > > "scrub" statements in the ruleset and removing "scrub" will restore
 > > the expected behaviour on 10.x?
 > I can confirm that I see exactly what you are saying on a stable/10 box.
 I had found 2 flavors of 9.x boxen: 9.1/9.2 that behave like 10.x and
 some 9.0 that are dropping SYN|FIN even in the presence of "scrub".
 The trouble is that the latter boxes are in full production, so I need
 some time to try to reproduce that on the text box.
 Eygene Ryabinkin                                        ,,,^..^,,,
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