Chapter 27 Content Filtering
USG20(W)-VPN Series User’s Guide
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Figure 293 Content Filter Lookup Procedure
1 A computer behind the USG tries to access a web site.
2 The USG 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 USG’s cache. The USG 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. All of the web site address records are also cleared
from the local cache when the USG restarts.
4 If the USG 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 USG, 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 USG’s content filter cache.
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