How can you quickly block IP communication to and from a certain IP address before traffic gets inspected by ACP?
Question
How can you quickly block IP communication to and from a certain IP address before traffic gets inspected by ACP?
Solution
To quickly block IP communication to and from a certain IP address before traffic gets inspected by the Access Control Policy (ACP) in a Cisco Firepower system, you can use the Prefilter Policy. Here's how you can do it:
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Access the Firepower Management Center (FMC) interface.
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Navigate to Policies > Access Control > Prefilter.
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Click "New Policy" to create a new Prefilter Policy, or edit an existing one.
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In the Prefilter Policy, click "Add Rule".
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In the new rule, set the Action to "Block".
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Under the "Networks" section, specify the IP address you want to block in the Source Networks and/or Destination Networks fields.
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Click "OK" to save the rule.
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Apply the Prefilter Policy to the relevant interfaces or security zones.
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Save and deploy the policy changes.
The Prefilter Policy processes traffic before the ACP, so this will effectively block the specified IP address before any further inspection takes place.
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