Proper Port Forwarding

[Dan Nelson]

In the last episode (Jun 06), Michael Sierchio said:
> On Wed, Jun 6, 2012 at 11:31 AM, Simon <simon at 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

Or raise net.inet.ip.fw.dyn_max to a larger number.  The default 4096 may be
too small.

-- 
	Dan Nelson
	dnelson at allantgroup.com