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Chapter 31 Content Filter Screens
ZyWALL USG 1000 User’s Guide
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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.
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.
Table 150 Anti-X > Content Filter > Filter Profile > Customization (continued)
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