snort- – highly flexible sniffer/NIDS


Snort is an open source network intrusion detection and prevention system.  It
is capable of performing real-time traffic analysis, alerting, blocking and
packet logging on IP networks.  It utilizes a combination of protocol analysis
and pattern matching in order to detect a anomalies, misuse and attacks.
Snort uses a flexible rules language to describe activity that can be considered
malicious or anomalous as well as an analysis engine that incorporates a
modular plugin architecture.  Snort is capable of detecting and responding in
real-time, sending alerts, performing session sniping, logging packets, or
dropping sessions/packets when deployed in-line.

Snort has three primary functional modes.  It can be used as a packet sniffer
like tcpdump(8), a packet logger (useful for network traffic
debugging, etc), or as a full blown network intrusion detection and prevention

WWW: https://www.snort.org/

net security

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