Operation Manual

Protect Your Network
6-23
The URL content filtering facility supported in the Vigor router consists of
the URL Access Control, Prevent web access from IP address,
Restrict Web Feature control, Exceptional Subnet handling, and
Time schedule functions. The URL Access Control aims at controlling
the access right of web sites by inspecting the URL string against
user-defined keywords. The Restrict Web Feature control intends to
block the malicious codes hidden in Web pages, such as Java Applet,
Active X, Cookies, Proxy, compressed files, and executable files. Also, it
is able to block all downloads of multimedia files from Web pages in order
to control the bandwidth usage.
The function of Prevent web access from IP address is used to avoid that
inappropriate web sites can be accessed through directly using IP
address in the URL locator, even though their URL strings match the
user-defined keywords. The function of Exceptional Subnet handling
allows the administrator to specify a group of hosts that are free from the
URL Access Control. This group of hosts could be defined as a set of IP
addresses or subnets. Finally, the Vigor router supports the Time
schedule function to control what time should perform the URL content
filtering facility. Now, let us move on the description of each item’s
usage in more detail.