ZyXEL Communications 70 Series - Manual (Page 280)

ZyWALL 5/35/70 Series User’s Guide
Chapter 16 Content Filtering Screens 280
16.3 Content Filtering with an External Database
When you register for and enable external database content filtering, your ZyWALL accesses
an external database that has millions of web sites categorized based on content. You can have
the ZyWALL block, block and/or log access to web sites based on these categories. The
content filtering lookup process is described below.
Web Proxy A server that acts as an intermediary between a user and the Internet to
provide security, administrative control, and caching service. When a proxy
server is located on the WAN it is possible for LAN users to circumvent
content filtering by pointing to this proxy server.
Schedule to Block Content filtering scheduling applies to the Filter List, Customized sites and
Keywords. Restricted web server data, such as ActiveX, Java, Cookies and
Web Proxy are not affected.
Always Block Click this option button to have content filtering always active with Time of
Day limitations not enforced. This is enabled by default.
Block From/To Click this option button to have content filtering only active during the time
interval specified. In the Block From and To fields, enter the time period, in
24-hour format, during which content filtering will be enforced.
Message to display
when a site is blocked
Denied Access
Message
Enter a message to be displayed when a user tries to access a restricted web
site. The default message is Please contact your network administrator!!
Exempt Computers
Enforce content filter
policies for all
computers
Select this checkbox to have all users on your LAN follow content filter
policies (default).
Include specified
address ranges in the
content filter
enforcement
Select this checkbox to have a specific range of users on your LAN follow
content filter policies.
Exclude specified
address ranges from the
content filter
enforcement
Select this checkbox to exempt a specific range of users on your LAN from
content filter policies.
Add Address Ranges
From Type the beginning IP address (in dotted decimal notation) of the specific
range of users on your LAN.
To Type the ending IP address (in dotted decimal notation) of the specific range
of users on your LAN, then click Add Range.
Address List This text field shows the address ranges that are blocked.
Add Range Click Add Range after you have filled in the From and To fields above.
Delete Range Click Delete Range after you select the range of addresses you wish to
delete.
Apply Click Apply to save your changes back to the ZyWALL.
Reset Click Reset to begin configuring this screen afresh.
Table 89 Content Filter : General
LABEL DESCRIPTION