** As of Snort 22.214.171.124, we are longer releasing Snort on SourceForge. Please head to http://www.snort.org from now on!**
Snort is a libpcap-based sniffer/logger which can be used as a network intrusion detection and prevention system. It uses a rule-based detection language as well as various other detection mechanisms and is highly extensible.
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Great software, thank you.