Chapter 31 Content Filter Screens

Table 150 Anti-X > Content Filter > Filter Profile > Customization (continued)

LABEL

DESCRIPTION

Blocked URL Keywords

This section allows you to block Web sites with URLs that contain

 

certain keywords in the domain name or IP address.

 

 

Add Blocked URL Keyword

Enter a keyword or a numerical IP address to block. You can also enter

 

a numerical IP address.

 

Use up to 63 case-insensitive characters (0-9a-zA-Z;/?:@&=+$\.-

 

_!~*'()%,). For example enter Bad_Site to block access to any web

 

page that includes the exact phrase Bad_Site. This does not block

 

access to web pages that only include part of the phrase (such as Bad

 

for example).

 

 

Blocked URL Keywords

This list displays the keywords already added.

 

 

Add

Click this button when you have finished adding the key words field

 

above.

 

 

Delete

Select a keyword from the Blocked URL Keywords list, and then click

 

this button to delete it from that list.

 

 

OK

Click OK to save your changes back to the ZyWALL.

 

 

Cancel

Click Cancel to exit this screen without saving your changes.

 

 

31.8 Keyword Blocking URL Checking

The ZyWALL checks the URL’s domain name (or IP address) and file path separately when performing keyword blocking.

The URL’s domain name or IP address is the characters that come before the first slash in the URL. For example, with the URL www.zyxel.com.tw/news/pressroom.php, the domain name is www.zyxel.com.tw.

The file path is the characters that come after the first slash in the URL. For example, with the URL www.zyxel.com.tw/news/pressroom.php, the file path is news/pressroom.php.

Since the ZyWALL checks the URL’s domain name (or IP address) and file path separately, it will not find items that go across the two. For example, with the URL www.zyxel.com.tw/ news/pressroom.php, the ZyWALL would find “tw” in the domain name (www.zyxel.com.tw). It would also find “news” in the file path (news/pressroom.php) but it would not find “tw/news”.

31.9 Content Filter Cache Screen

Click Anti-X > Content Filter > Cache to display the Content Filter Cache screen. Use this screen to view and configure your ZyWALL’s URL caching. You can also configure how long a categorized web site address remains in the cache as well as view those web site addresses to which access has been allowed or blocked based on the responses from the external content filtering server. The ZyWALL only queries the external content filtering database for sites not found in the cache.

You can remove individual entries from the cache. When you do this, the ZyWALL queries the external content filtering database the next time someone tries to access that web site. This allows you to check whether a web site’s category has been changed.

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ZyWALL USG 1000 User’s Guide