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

hiren panchasara hiren.panchasara at
Fri May 30 17:58:15 UTC 2014

- bugs (as this is not related to it)

On Wed, May 28, 2014 at 10:46 PM, Eygene Ryabinkin <rea at> wrote:

> clearing FIN bit for SYN packets was
> the standard behaviour of pf since approximately at least 10 years,

I am curious, what's the rationale for this behavior? Why does PF
clear the FIN bit for such a packet being a firewall?


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