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Chapter 27 Content Filtering
USG20(W)-VPN Series User’s Guide
417
• Restrict Web Features
The USG can disable web proxies and block web features such as ActiveX controls, Java applets
and cookies.
• Customize Web Site Access
You can specify URLs to which the USG blocks access. You can alternatively block access to all
URLs except ones that you specify. You can also have the USG block access to URLs that contain
particular keywords.
Content Filtering Configuration Guidelines
When the USG receives an HTTP request, the content filter searches for a policy that matches the
source address and time (schedule). The content filter checks the policies in order (based on the
policy numbers). When a matching policy is found, the content filter allows or blocks the request
depending on the settings of the filtering profile specified by the policy. Some requests may not
match any policy. The USG allows the request if the default policy is not set to block. The USG
blocks the request if the default policy is set to block.
External Web Filtering Service
When you register for and enable the external web filtering service, your USG accesses an external
database that has millions of web sites categorized based on content. You can have the USG block,
block and/or log access to web sites based on these categories.
Keyword Blocking URL Checking
The USG 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 USG 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 USG 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”.
Finding Out More
for content filtering background/technical information.
27.1.3 Before You Begin
• You must configure an address object, a schedule object and a filtering profile before you can set
up a content security policy.
• You must have Content Filtering license in order to use the function.subscribe to use the external
database content filtering (see the
Licensing
>
Registration
screens).
Содержание ZyWall USG20-VPN
Страница 17: ...17 PART I User s Guide ...
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Страница 99: ...99 PART II Technical Reference ...
Страница 100: ...100 ...
Страница 151: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 151 Configuration Network Interface Ethernet Edit External Type ...
Страница 152: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 152 Configuration Network Interface Ethernet Edit External Type ...
Страница 154: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 154 Configuration Network Interface Ethernet Edit Internal Type ...
Страница 155: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 155 Figure 121 Configuration Network Interface Ethernet Edit OPT ...
Страница 156: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 156 Configuration Network Interface Ethernet Edit OPT ...
Страница 170: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 170 Figure 127 Configuration Network Interface PPP Add ...
Страница 178: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 178 Figure 129 Configuration Network Interface Cellular Add Edit ...
Страница 194: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 194 Figure 139 Configuration Network Interface VLAN Add Edit ...
Страница 206: ...Chapter 9 Interfaces USG20 W VPN Series User s Guide 206 Figure 141 Configuration Network Interface Bridge Add Edit ...
Страница 282: ...Chapter 15 UPnP USG20 W VPN Series User s Guide 282 Figure 190 Network Connections My Network Places Properties Example ...
Страница 340: ...Chapter 21 IPSec VPN USG20 W VPN Series User s Guide 340 Figure 226 Configuration VPN IPSec VPN VPN Connection Edit IKE ...
Страница 348: ...Chapter 21 IPSec VPN USG20 W VPN Series User s Guide 348 Figure 228 Configuration VPN IPSec VPN VPN Gateway Add Edit ...
Страница 378: ...Chapter 22 SSL VPN USG20 W VPN Series User s Guide 378 Create a Web Application SSL Application Object ...
Страница 591: ...Chapter 31 Log and Report USG20 W VPN Series User s Guide 591 Figure 418 Configuration Log Report Email Daily Report ...
Страница 659: ...Appendix B Legal Information USG20 W VPN Series User s Guide 659 Environmental Product Declaration ...