ZyWALL 5/35/70 Series User’s Guide

Figure 130 Content Filtering Lookup Procedure

1A computer behind the ZyWALL tries to access a web site.

2The ZyWALL looks up the web site in its cache. If an attempt to access the web site was made in the past, a record of that web site’s category will be in the ZyWALL’s cache. The ZyWALL blocks, blocks and logs or just logs the request based on your configuration.

3Use the CONTENT FILTER Cache screen to configure how long a web site address remains in the cache as well as view those web site addresses (see Section 16.7 on page 287). All of the web site address records are also cleared from the local cache when the ZyWALL restarts.

4If the ZyWALL has no record of the web site, it will query the external content filtering database and simultaneously send the request to the web server.

The external content filtering database may change a web site’s category or categorize a previously uncategorized web site.

5The external content filtering server sends the category information back to the ZyWALL, which then blocks and/or logs access to the web site. The web site’s address and category are then stored in the ZyWALL’s content filtering cache.

16.4Content Filter Categories

Click SECURITY, CONTENT FILTER, and then the Categories tab to display the CONTENT FILTER Categories screen. Use this screen to configure category-based content filtering. You can set the ZyWALL to use external database content filtering and select which web site categories to block and/or log. You must register for external content filtering before you can use it. Use the REGISTRATION screens (see Chapter 4 on page 100) to create a myZyXEL.com account, register your device and activate the external content filtering service.

Do the following to view content filtering reports (see Chapter 17 on page 290 for details).

1Log into myZyXEL.com and click your device’s link to open it’s Service Management screen.

2Click Content Filter in the Service Name field to open the Blue Coat login screen.

3Enter your ZyXEL device's MAC address (in lower case) in the Name field. You can find this MAC address in the Service Management screen (Figure 136 on page 292). Type your myZyXEL.com account password in the Password field. Click Submit.

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Chapter 16 Content Filtering Screens