On Wed, Jun 6, 2012 at 11:31 AM, Simon <si...@optinet.com> wrote:

> This easily causes DoS for when too many FIN_WAIT_2 are created and IPFW
> stops forwarding using the rule above because of "too many dynamic rules"

Change the defaults for the fw.dyn sysctl MIB nodes

to something like

net.inet.ip.fw.dyn_short_lifetime=3
net.inet.ip.fw.dyn_udp_lifetime=3
net.inet.ip.fw.dyn_rst_lifetime=1
net.inet.ip.fw.dyn_fin_lifetime=1
net.inet.ip.fw.dyn_syn_lifetime=10
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