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firewall setup

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http://forums.fedoraforum.org – I have just setup an F17 box as a firewall. Everything is working fine, except for one minor catch: In short, the firewall box itself cannot access any services (eg, dns, ntp) unless I explicitly open up ports for them on the wan interface. My config: the box has 4 NICs: eth0 is192.168.1.1 (inside lan gateway), eth1 is 192.168.2.1 (dmz lan gateway) eth2 is my wan interface (with a static IP), and eth4 is 192.168.1.103 - a legacy inside server address. I would like to be able to use the eth3 interface to make the firewall box look like just another server on the inside lan. That way, I (HowTos)