Snort
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Description
This network intrusion detection and prevention system conducts traffic analysis and packet logging on IP networks. Through protocol analysis, content searching, and various pre-processors, Snort detects thousands of worms, vulnerability exploit attempts, port scans, and other suspicious behavior. Snort uses a flexible rule-based language to describe traffic that it should collect or pass, and a modular detection engine. The related free Basic Analysis and Security Engine (BASE) is a web interface for analyzing Snort alerts.