3 content filter general screen, Figure 150 content filtering lookup procedure – ZyXEL Communications ZyWALL 2 Plus User Manual
Page 224
Chapter 12 Content Filtering Screens
ZyWALL 2 Plus User’s Guide
224
Figure 150 Content Filtering Lookup Procedure
1 A computer behind the ZyWALL tries to access a web site.
2 The 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.
3 Use 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
). All of the web site address records are also cleared from the local cache when the
ZyWALL restarts.
4 If 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.
5 The 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.
12.3 Content Filter General Screen
Click SECURITY > CONTENT FILTER to open the CONTENT FILTER General
screen.
Use this screen to enable content filtering and configure general settings. You must register for
external content filtering before you can use it. Use the REGISTRATION screens (see
) to create a myZyXEL.com account, register your device and activate
the external content filtering service.