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Cisco IronPort AsyncOS 7.7.5 for Web User Guide
Chapter 17      URL Filters
Configuring the URL Filtering Engine
Cisco IronPort Web Usage Controls shares some database components with the Web Reputation Filters 
(WBRS) database. Because of this shared information, Cisco recommends fully participating in the 
SensorBase Network because it allows Cisco IronPort Web Usage Controls to validate and categorize all 
URLs dynamically classified by the Dynamic Content Analysis engine, including all URLs that could 
not otherwise be classified, improving overall efficacy. 
For information about update intervals and the Cisco IronPort update server, see 
.
The URL categories database includes many different factors and sources of data internal to Cisco and 
from the Internet. One of the factors occasionally considered, heavily modified from the original, is 
information from the Open Directory Project. 
Tip
To see what category a particular web site is assigned to, go to the URL in 
Configuring the URL Filtering Engine 
To apply predefined category settings to policy groups and configure custom settings to manage web 
transactions, see the sections below. By default, the Cisco IronPort Web Usage Controls URL filtering 
engine is enabled in the System Setup Wizard.
Step 1
Navigate to the Security Services > Acceptable Use Controls page.
Step 2
Click Edit Global Settings.
Step 3
Verify the Enable Acceptable Use Controls property is enabled. 
Note
For information about the Application Visibility and Control setting, see 
 
Step 4
Choose whether or not to enable the Dynamic Content Analysis Engine.
For more information on the Dynamic Content Analysis Engine, see 
.
Step 5
Choose the default action the Web Proxy should use when the URL filtering engine is unavailable, either 
Monitor or Block. Default is Monitor.
Step 6
Submit and commit your changes.
Managing Updates to the Set of URL Categories 
The set of predefined URL categories for Cisco IronPort Web Usage Control may occasionally be 
updated, in order to accommodate new web trends and evolving usage patterns.