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Update Filter
Since content on the Internet is constantly changing, make
sure you update the Web Site Filter used by the Internet
Firewall on a regular basis. When you subscribe to the Web
Site Filter, you can specify that it is updated automatically
every week for one year.
It is important to note that host names, and not IP
addresses, are used for all Internet filtering functions for
several reasons. There are two reasons for this:
I
I
Figure 29 Filter Update Window
Many blocked sites operate server pools, where many
machines service a single host name, making it
impractical and difficult to add and maintain the
numerical addresses of every server in the pool.
Many sites included in the Web Site Filter regularly
change the IP address of the server to try to bypass the
Web Site Filters. This makes maintaining a current list
subscription critical for effective content filtering.
Update Filter
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