44. This allows for IP
characteristics such as time stamp, router alert, strict source route, and others to be
blocked or allowed.
In addition to filtering based on IP options, this dialog box also allows for IP routing to be
enabled, which allows for original packets received by the ISA server to be forwarded to
their destinations. If this option is not enabled, ISA repackages the data in its own packet
and forwards it to the destination server??”a more secure option, but one that requires
additional overhead on the server. For more information on these options, see Chapter 15.
Specifying DiffServ Preferences
ISA Server 2004 Service Pack 2 introduced the ability for ISA Server to provide for Quality
of Service (QoS) for IP traffic through the implementation of IP DiffServ. This feature was
ported over to ISA Server 2006 as well. DiffServ allows administrators to give priority to
traffic sent to specific domains, URLs, or originating from particular networks. Using this
concept, an ISA admin can prioritize the traffic that passes through the server.
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Exploring the ISA General Node
FIGURE 3.45 Specifying DiffServ preferences.
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