ZyXEL Communications 70 Series User Manual

ZyWALL 5/35/70 Series User’s Guide

Chapter 16 Content Filtering Screens

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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