. From/Listener??”The From/Listener column displays the network or listener from
which rule traffic will arrive. ISA examines only the traffic from this network when
applying the rule.
. To??”The To column represents the destination of traffic. Only traffic sent to this
network or set of networks will have the particular rule applied.
. Condition??”The Condition column allows for individual rules to only apply to particular
users or groups of users. User granularity can be allowed only when the
Firewall Client is deployed, so this is often simply set to All Users when the full
client is not deployed.
Advanced information on configuring access rules can be found in Chapter 5.
FIGURE 3.13 Exploring sample firewall rules.
82 CHAPTER 3 Exploring ISA Server 2006 Tools and Concepts
Examining Publishing Rules and the Concept of Reverse Proxy
A server publishing rule is more complicated than a simple network access rule, in that it
allows the ISA server to mimic a destination server such as a web server and act as a
reverse proxy server to the client requests. A reverse proxy server is a system that acts as a
bastion host for requesting clients, protecting the server from direct attack by proxying all
requests that are sent to it, making them go through the reverse proxy server itself.
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