CHAPTER 44: Configuring SonicWALL Content Filtering Service
Content Filter Type
There are three types of content filtering available on the SonicWALL security appliance.
•SonicWALL CFS - Selecting SonicWALL CFS as the Content Filter Type allows you to use the SonicWALL Content Filtering Service that is available as an upgrade. You can obtain more infor- mation about SonicWALL Content Filtering Service at <http://www.sonicwall.com/products/cfs.html>
•N2H2 - N2H2 is a third party content filter software package supported by SonicWALL security appliance.
•Websense Enterprise - Websense Enterprise is also a third party content filter list supported by SonicWALL security appliance.
Apply filter and Restrict Web Features on - Allows you to specify the LAN interface for applying content filtering or Restrict Web Features protection.
Restrict Web Features
Restrict Web Features enhances your network security by blocking potentially harmful Web applications from entering your network.
Restrict Web Features are included with SonicOS. Select any of the following applications to block:
•ActiveX - ActiveX is a programming language that embeds scripts in Web pages. Malicious pro- grammers can use ActiveX to delete files or compromise security. Select the ActiveX check box to block ActiveX controls.
•Java - Java is used to download and run small programs, called applets, on Web sites. It is safer than ActiveX since it has
•Cookies - Cookies are used by Web servers to track Web usage and remember user identity. Cookies can also compromise users' privacy by tracking Web activities. Select the Cookies check box to disable Cookies.
•Access to HTTP Proxy Servers - When a proxy server is located on the WAN, LAN users can cir- cumvent content filtering by pointing their computer to the proxy server. Check this box to prevent LAN users from accessing proxy servers on the WAN.
•Known Fraudulent Certificates - Digital certificates help verify that Web content and files origi- nated from an authorized party. Enabling this feature protects users on the LAN from downloading malicious programs warranted by these fraudulent certificates. If digital certificates are proven fraudulent, then the SonicWALL security appliance blocks the Web content and the files that use these fraudulent certificates. Known fraudulent certificates blocked by SonicWALL security appli- ance include two certificates issued on January 29 and 30, 2001 by VeriSign to an impostor mas- querading as a Microsoft employee.
You can choose LAN for applying your Restrict Web Features protection from the Apply filter and Restrict Web Features on setting in Content Filter Type.
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