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TriSentry, a Unix Intrusion Detection System
Intrusion detection isn't anything new. Throughout the history of computer networking, administrators have worked to find ways of tracking system security breaches and identifying the culprits behind them. Network administrators have a wide range of sophisticated tools to improve auditing, and to report and block intrusion. The TriSentry suite is one such free tool.
TriSentry is composed of three applications. PortSentry detects, reports, and blocks port scanning. LogSentry examines system logs for security violations and generates administrative reports. HostSentry monitors user logins and activities, detecting breaches and unusual behavior.
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