Draytek Vigor2500V Manual page 78

Firewall
The URL content filtering facility implemented on 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.
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