How to configure and implement a DMZ

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How to configure and implement a DMZ

What are the constraints of setting up a DMZ and what are the basic appliances needed?

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Safe Harbor

DMZs (demilitarized zones) are the network equivalent of neutral ground. They provide an isolated network segment for public-facing services, such as Web and mail servers. The private side of your network is protected from these servers, as their public accessibility makes them more vulnerable to compromise.

The standard approach for creating a DMZ involves the use of a firewall with three network interfaces. For more information and an illustration, read Choosing the Right Firewall Topology.


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  • This was first published in July 2006