Note: To see URL category and reputation information in events and application details, you must create at least one rule with a URL condition
Limitations of URL Filtering
Connection will establish 3-way TCP handshake. Once SSL Exchange starts or HTTP request received, FP will be able to action (3-5 packets)
Uncategorized URLs will pass through FP unless they are explicitly blocked
FP won't block searches on blocked categories. For example, using a web search to search for amazon.com is not blocked, but browsing to amazon.com is blocked
Due to low memory, low level appliances will use more generic matches. Example, the system might evaluate mail.google.com using the google.com category and reputation
Impacted models are ASA5506-X, ASA5506H-X, ASA5506W-X, ASA5508-X, ASA5512-X, ASA5515-X, ASA5516-X, and ASA5525-X
You can configure HTTP Response page (which will be displayed when ACP action is Block/Block with reset) and Interactive HTTP Response page (which will be displayed when ACP action is Interactive Block/Interactive Block with reset)
It won't be displayed for HTTPS blocked URLs
You can use URL filtering rule for allowing HTTPS access to a website while blocking HTTP access which is for security reason
Create an ACP rule which matches HTTPS application and X URL - Action Allow
Create an ACP rule which matches HTTP application and X URL - Action Block
How URL Lookup Process works?
In order to accelerate the URL lookup process, the URL filtering provides a dataset that is installed on a Firepower System locally. Dependent upon the amount of memory (RAM) available on an appliance, there are two types of datasets:
This is what is configured on all the routers and switches.
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when use :
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