ZyXEL Communications 200 Series - Manual (Page 549)

Chapter 31 Content Filtering
ZyWALL USG 100/200 Series User’s Guide
549
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 Section 31.7 on page 546 ). 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 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.