CHAPTER 5 Deploying ISA Server 2006 as a Firewall
Establishing a perimeter network is as simple as putting a third network card into an ISA
firewall and setting up a dedicated network. The third NIC is then plugged into that
network to establish ISA??™s presence in the network and force traffic through the ISA server.
The final step is to define the IP address of the network in the ISA console and to set up
the network and firewall rules between the new perimeter network and the internal
network. More information on these topics, including step-by-step instructions, can be
found later in this chapter.
Deploying Additional Networks
ISA is not limited to three defined networks. On the contrary, the software is limited only
to setting up as many networks as there are network cards in the server itself.
Theoretically, additional networks can be established for wireless access points, server-only
networks, client networks, and any other type of network. Defining the network is as
straightforward as configuring the proper network definitions and network rules in the
ISA console.
Defining ISA Firewall Networks
As previously mentioned, ISA is fully capable of supporting numerous networks, and
makes it possible to create firewall rules that specifically allow or deny traffic from certain
networks to other networks.
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