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

Eygene Ryabinkin rea at
Thu May 29 08:00:10 UTC 2014

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> wrote:
> > 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                                        ,,,^..^,,,
[ Life's unfair - but root password helps!           | ]
[ 82FE 06BC D497 C0DE 49EC  4FF0 16AF 9EAE 8152 ECFB | ]
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