Linux Demilitarized Zone (DMZ) Ethernet Interface Requirements and Configuration
(The)Demilitarized zone, used to secure an internal network from external access. You can use Linux firewall to create DMZ easily. There are many different ways to design a network with a DMZ. The basic method is to use a single Linux firewall with 3 Ethernet cards. The following simple example discusses DMZ setup and forwarding public traffic to internal servers. There's a little advanced know-how required here and he recommends a couple good firewalls to set up such functionality just in case this very useful guide doesn't fit the bill. If you are looking to set up a Linux Demilitarized zone a couple of options include EnGarde, IpCop and others.