MicroNugget: How to Prevent TCP Syn-Flood Attacks

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In this video, Keith Barker covers what TCP syn-flood attacks are and how attackers can use them to overload a web server. He also describes how you can prevent these attacks from reaching your critical servers by using an ASA firewall. Finally, he shows you how you can test this to make sure that it is working properly.

After watching this video, you will not only know what TCP syn-flood attacks are but also how to stop them in an ASA firewall. Keith shows you this by simulating a real-life syn-flood attack on a web server. He then shows you how you can easily stop this by limiting the number of half-formed synchronization requests in ASA by using class and policy maps. This allows the firewall to verify synchronization requests once a specified threshold has been reached, only passing them onto the web server once they are fully formed. Finally, he demonstrates how you can verify that this is actually happening.

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