From owner-freebsd-net@FreeBSD.ORG  Tue Sep 14 18:52:06 2004
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Date: Tue, 14 Sep 2004 14:52:03 -0400
From: "Eric W. Bates" <ericx_lists@vineyard.net>
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Subject: To many dynamic rules created by infected machine
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Friends run an IT business and I helped build them a firewall using ipfw.

The box has multiple interfaces; one of which is untrusted and it is 
where they put suspect machines (customer boxes with high likelihood of 
viruses and other evil Windoze ailments).

Their network is well protected; however there is now an inadvertent DOS 
when a particularly virulent machine performs a sweep attack on some 
block of IP, because we have a check-state/keep-state.

Sep 11 16:00:01 <kern.crit> hostname /kernel: ipfw: install_state: Too 
many dynamic rules

Is there a way to limit the number of rules a given host can create in x 
number of minutes?


Thanks for your time.
--
Eric W. Bates