These default options create standard
firewall policies based on common configurations as follows:
. Block All??”This option does not create any firewall rules automatically. It is up to
the administrator to create the appropriate policies after the wizard has been run.
FIGURE 3.8 Defining the internal network.
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Configuring Networks with ISA Console Network Wizards and Tools
FIGURE 3.9 Defining Perimeter network IP address ranges.
FIGURE 3.10 Selecting a firewall policy.
. Block Internet Access, Allow Access to Network Services on the Perimeter
Network??”This policy creates default rules that allow only limited DNS traffic from
the Internet network to the DMZ network.
. Block Internet Access, Allow Access to ISP Network Services??”This option creates
rules that allow DNS access only from internal clients to the external network. It is
used in situations when clients get their DNS services from an Internet Service
Provider (ISP).
78 CHAPTER 3 Exploring ISA Server 2006 Tools and Concepts
. Allow Limited Web Access??”This option, more common in many organizations,
creates firewall rules that allow web browsing via the HTTP, HTTPS, and FTP ports to
the external network.
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