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Snort is a libpcap-based packet sniffer/logger which can be used
as a lightweight network intrusion detection system. It features
rules based logging and can perform protocol analysis, content
searching/matching and can be used to detect a variety of attacks
and probes, such as buffer overflows, stealth port scans, CGI
attacks, SMB probes, OS fingerprinting attempts, and much more.
Snort has a real-time alerting capability, with alerts being sent
to syslog or a separate "alert" file. As of version 1.1 it can
also send WinPopup messages via Samba.
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