ZyXEL Communications ZyWALL USG 100 Series User Manual page 559

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
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 queries the external content filter
database and simultaneously sends the request to the web server.
5 The external content filter server sends the category information back to the ZyWALL,
which then blocks and/or logs access to the web site based on the settings in the content
filter profile. The web site's address and category are then stored in the ZyWALL's
content filter cache.
ZyWALL USG 100/200 Series User's Guide
Chapter 32 Content Filtering
Section 32.7 on page 556). All
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