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Linux Firewalls by Michael Rash

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Chapter 5. INTRODUCING PSAD: THE PORT SCAN ATTACK DETECTOR

In this chapter I'll introduce the Port Scan Attack Detector, or psad for short. We will cover installation, administration, and configuration issues in this chapter and leave the heavy lifting on psad operations and auto-response for the next two chapters.

History

The software project that became psad began as a part of Bastille Linux in the fall of 1999, when the Bastille development team decided that Bastille should offer a lightweight network intrusion detection component. At the time, Peter Watkins was developing the excellent firewalling scripts that are still bundled with Bastille today, so it was a natural next step to develop an IDS tool based on information provided in firewall ...

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