ZyWALL 5/35/70 Series User’s Guide

 

Table 89 Content Filter : General

 

 

 

 

LABEL

DESCRIPTION

 

 

 

 

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

Enter a message to be displayed when a user tries to access a restricted web

 

Message

site. The default message is Please contact your network administrator!!

 

Exempt Computers

 

 

 

 

 

Enforce content filter

Select this checkbox to have all users on your LAN follow content filter

 

policies for all

policies (default).

 

computers

 

 

Include specified

Select this checkbox to have a specific range of users on your LAN follow

 

address ranges in the

content filter policies.

 

content filter

 

 

enforcement

 

 

Exclude specified

Select this checkbox to exempt a specific range of users on your LAN from

 

address ranges from the

content filter policies.

 

content filter

 

 

enforcement

 

 

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.

 

 

 

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.

Chapter 16 Content Filtering Screens

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