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Can a firewall alone effectively block port-scanning activity?

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The best line of defense against port scanning threats is a good intrusion prevention system (IPS). Many commercial firewalls -- both hardware and software -- come with the technology, either built-in or available as an optional feature. Alternatively, you may purchase and install a dedicated IPS to protect your network against attack. These systems monitor your network for potentially malicious traffic and block it before the traffic reaches the internal network. In a port-scanning scenario, the IPS recognizes that a particular source address is scanning your network. The intrusion prevention system then blocks that system's access and does so for a specified period of time.

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This was first published in February 2008

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