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ISA Server 2004 Configuration Guide 91
Introduction
The ISA Server 2004 firewall comes with a number of pre-built Network Templates you can
use to automatically configure Networks, Network Rules and Access Rules. The Network
Templates are designed to get you started quickly by creating a base configuration on which
you can build. You can choose from one of the following Network Templates:
• Edge Firewall
The Edge Firewall Network Template is used when the ISA Server 2004 firewall has a
network interface directly connected to the Internet and a network interface connected to
the Internal network
• 3-Leg Perimeter
The 3-Leg Perimeter Network Template is used when you have an external interface,
Internal interface and a perimeter network segment (DMZ) interface. This template
configures the addresses and relationships between these networks.
• Front Firewall
The Front Firewall Template is used when the ISA Server 2004 firewall serves as a front-
end firewall in a back-to-back firewall configuration.
• Back Firewall
The Back Firewall Template is used when the ISA Server 2004 firewall is located behind
another ISA Server 2004 firewall, or a third-party firewall.
• Single Network Adapter
The Single Network Adapter Template is a special configuration that removes the ISA
Server 2004 firewall’s network firewall capabilities. Instead, the Single Network Adapter
template configures the machine as a unihomed Web caching server.
In this ISA Server 2004 Configuration Guide document, we outline the procedures to carry
out two scenarios:
• Scenario 1: The Edge Firewall Configuration
• Scenario 2: The 3-Leg Perimeter Configuration
You only need to go through the section that applies to your current setup. If you followed the
complete instructions in the first chapter of this guide, then you should perform the
procedures in the second scenario. Otherwise, you can use the procedures provided in the
first scenario.