So I'm trying to setup my firewall rules for IP forwarding, using the two 
commands
       
root@avanti# ipfwadm -F -p deny 
 This works with no complants

root@avanti# ipfwadm -F -a m -S 192.168.1.0/24 -D 0.0.0.0/0 
"my network is 192.168.1.0"
 This fails giving me the message:
ipfwadm: setsockopt failed: Invalid argument

if I setup my default policy to be masquerading
root@avanti# ipfwadm -F -p masquerade

I get no complaints from this command and IP forwarding works well,
but now I worried about and I qoute from the HOWTO i found on the web.

"Do not make your default policy be masquerading - otherwise someone who 
can manipulate their routing will be able to tunnel straight back through 
your
gateway, using it to masquerade their identity! "

Can someone explain to me what I'm doing wrong here?

I'm running redhat 5.2 for Alpha, 2.0.36
and ipfwadm-2.3.0-6



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