FreeBSD 7, bridge, PF and syn flood = very bad performance

Stefan Lambrev stefan.lambrev at
Sat Jan 26 12:52:44 PST 2008

Dag-Erling Smørgrav wrote:
> Stefan Lambrev <stefan.lambrev at> writes:
>> Does anyone try to see PF with "keep state" in action when under syn
>> flood attack?
> Try "synproxy state" instead of "keep state".
 From man pf.conf - Rules with synproxy will not work if pf(4) operates 
on a bridge(4).

My short experience from today shows that synproxy can't handle syn 
flood with random source IP - 150kpps,
but I'll test this  after few days.

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