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Step 1.
A computer sends an HTTP request to a web server.
Step 2.
The ZyWALL looks up the web site in its local database. If an attempt to access the web site was
made in the past, a record of that web site's rating will be in the ZyWALL's cache. The ZyWALL
will either block or forward the request based on the rating policy you configure.
If the ZyWALL doesn't have a record of the web site, it will query the lookup server and
simultaneously send the request to the web server.
Step 3.
The lookup server sends the rating information back to the ZyWALL, which then either forwards
or blocks the web content. The web site address is then also stored in the ZyWALL's content
filtering cache.
12.4 Checking Content Filtering Activation
After you register for content filtering, the web site displays a registration successful web page. This does not
mean the content filtering is active yet. You need to wait up to ten minutes for the content filtering to be
activated.
Since there will be no activation notice, do the following:
Step 1.
Go to your device's web configurator's Content Filtering, Categories screen.
Step 2.
Select at least one category and click Apply.
Step 3.
Enter a valid URL or IP address of a web site in the Test if Web site is blocked field and click
the Test Against Internet Server button.
When content filtering is active, you should see an access blocked or access forwarded message.
An error message displays if content filtering is not active.
12.5 Configuring Categories
To register for and configure category-based content filtering, click CONTENT FILTER, and then the
Categories tab. The screen appears as shown.
Content Filtering Screens
ZyWALL 2 Series User's Guide
12-5
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