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24 Starter Guide SurfControl Web Filter for ISA v5.5
I
NSTALLATION
D
ECISIONS
Other Considerations
2
OTHER CONSIDERATIONS
This section contains general information that you should be aware of when installing and configuring
SurfControl Web Filter.
INTERNET THREAT DATABASE
SurfControl’s Internet Threat Database is the best category database in the Internet security industry and
provides the most accurate, current, and relevant content listing available. The Internet Threat Database
includes:
• 55 structured categories.
• 24 million sites, including more than 3.5 billion web pages.
• International content, including 70 languages and over 200 countries.
• Daily updates (more than 100,000 new sites a week).
– The Internet Threat Database is stored in an encrypted, size-optimized file called
SurfControl
Categories.csf.
– Incremental updates (up to 60 MB) are stored in an encrypted file called
SurfControl
Categories.cdb.
– With Web Filter, you can manually categorize destinations; these are added to the SurfControl
Manual Categories.ucf
file.
– VCA categorized destinations are added to the
SurfControl VCA Categories.ucf file.
Web Filter checks the categorization files in the following order:
1 Manually-categorized sites (
SurfControl Manual Categories.ucf).
2 Incremental updates (
SurfControl Categories.cdb).
3 Internet Threat Database (SurfControl Categories.csf).
4 VCA categorized sites (
SurfControl VCA Categories.ucf).
CATEGORIZATION OPTIONS
You can select whether to send feedback on uncategorized sites back to SurfControl, and how Web Filter
categorizes your own domains.
Internet Threat Database Improvement Program
When Web Filter encounters an uncategorized Web site, it can send the details anonymously to
SurfControl. This helps SurfControl to improve the effectiveness of the Internet Threat Database in future
updates.
Company & Intranet
You can enter your company domains and Intranet site addresses during the Configuration Wizard so that
Web Filter categorizes them as Company & Intranet.