TRITON - Web Security Help
Refine Filtering Policies
You can override the default threshold values for each category or protocol in any
category or protocol filter.
3. When you are finished, click OK to cache your changes. Changes are not
implemented until you click Save All.
Any changes to the defaults have the potential to affect any category and protocol
filters that enforce Bandwidth Optimizer restrictions.
To manage bandwidth usage associated with a particular protocol, edit the active
protocol filter or filters.
To manage bandwidth usage associated with a particular URL category, edit the
appropriate category filter or filters.
When you filter categories based on HTTP bandwidth usage, Websense software
measures total HTTP bandwidth usage over all ports specified as HTTP ports for
Managing traffic based on file type
When you create a category filter, you can define filtering based on file extensions,
restricting access to particular file types from sites in certain categories. For example,
permit the category Sports, but block video files from sites in the Sports category.
Websense software provides several predefined file types, or groupings of file
extensions used for similar purposes. These file type definitions are maintained in the
Master Database, and may be changed as part of the Master Database update process.
You can implement filtering using predefined file types, modify the existing file type
definitions, or create new file types. Note, however, that you cannot delete Websense-
defined file types, or delete the file extensions associated with them.
When a user requests a site, Websense software first determines the site category, and
then checks for filtered file extensions.
When a user tries to access a file whose extension is blocked, the Reason field on the
Websense block page indicates that the file type was blocked. For more information,
, page 85.
To implement full filtering for video and audio Internet
media, combine protocol-based filtering with file type
filtering. In this case, protocol filtering handles streaming
media, while file type filtering handles files that can be
downloaded and then played.
When multiple group policies could apply to a user
request, file type blocking is not performed.