Two-Faced: Setting up a Simple Linux Firewall
"Don't assume that a firewall is the ultimate in security. If the security of some of the boxes on your internal network is poor, the firewall might help cover for this, but it's not a substitute for trying to improve them. Also, the kind of "two-interface firewall" I'm discussing here (see Diagram, below) is possibly a little too simple: arguably the webserver should be in a "DMZ", hung off the firewall on a third ethernet card (see the quickstart for Three-Interface Firewall and possibly the Shorewall FAQ)."
(Submitted by Noel Tue Oct 26, 2004 )
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