Web Filtering

Web filtering lets you manage Internet usage by preventing access to inappropriate Web content.

There are two types of Web filtering solutions.

• The integrated Web filtering solution intercepts every HTTP request in a TCP connection. In this case, the decision making is done on the device after it identifies the category for a URL either from user-defined categories or from a category server (SurfControl Content Portal Authority provided by Websense).

Note: The integrated Web filtering feature is a separately licensed subscription service. When the license key for Web filtering has expired, no URLs are sent to the category server for checking, only local user-defined categories are checked.

• The redirect Web filtering solution intercepts HTTP requests and sends them to an external URL filtering server, provided by Websense, to determine whether to block the requests.

Note: Redirect Web filtering does not require a license.

For information about which devices support the features documented in this chapter, see Support Overview for Security Features.

This chapter includes the following topics:

• Understanding Integrated Web Filtering
• What Happens When Both Web Filtering and Antivirus Scanning Are Employed?
• Configuring Integrated Web Filtering
• Understanding Redirect Web Filtering
• Configuring Redirect Web Filtering
• Verifying Web Filtering Configurations