. Front Firewall??”A front firewall is an ISA server that is deployed as a dual-NIC
server, but one that works in combination with a back firewall to provide two routes
out of a network that is sandwiched between both ISA firewalls.
. Back Firewall??”The back firewall template applies rules that provide for the second
ISA server in the front/back firewall design already described.
. Single Network Adapter??”A single network adapter template, commonly deployed
for caching-only servers or for reverse-proxy capabilities in an existing packet-filter
firewall DMZ, provides a template for a server with a single NIC. Although not a traditional
firewall, this configuration is actually quite common for securing services
such as OWA and web sites.
Deploying an ISA Firewall Using the Edge Firewall Template
When deploying ISA Server 2006 as a firewall, which is the focus of this particular chapter,
several of the default network templates can be used to configure the initial server
settings. Each template is used in different scenarios, depending on the specific firewall
role that the ISA server is to fulfill. The most basic ISA firewall is the edge server role, and
the process for configuring an edge server is described in the following section.
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