Content Filter Technical Reference; Figure 379 Content Filter Lookup Procedure - ZyXEL Communications ZyWALL USG 300 User Manual

Unified security gateway

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Table of Contents

Chapter 32 Content Filtering

Table 176 Anti-X > Content Filter > Cache (continued)

32.8 Content Filter Technical Reference

This section provides content filtering background information.

External Content Filter Server Lookup Procedure

The content filter lookup process is described below.

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.

This field shows whether access to the web site's URL was blocked or allowed.

Click the column heading to sort the entries. Point the triangle up to display the

blocked URLs before the URLs to which access was allowed. Point the triangle

down to display the URLs to which access was allowed before the blocked URLs.

This is a web site's address that the ZyWALL previously checked with the external

content filtering database.

This is the number of minutes left before the URL entry is discarded from the

Click the Delete icon to remove the URL entry from the cache.

Type the maximum time to live (TTL) (1 to 720 hours). This sets how long the

ZyWALL is to keep an entry in the URL cache before discarding it.

The external content filtering database frequently adds previously uncategorized

web sites and sometimes changes a web site's category. Setting this limit higher

will speed up the processing of web access requests but will also make it take

longer for the ZyWALL to reflect changes in the external content filtering database.

Click Apply to save your changes back to the ZyWALL.

Click Reset to begin configuring this screen afresh.

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