Port Scan Attack Detector psad is a collection of three system daemons that are designed to work with the Linux Netfilter.
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Port Scan Attack Detector Description

psad is a collection of three system daemons that are designed to work with the Linux Netfilter. The Port Scan Attack Detector (psad) is a collection of three system daemons that are designed to work with the Linux Netfilter firewalling code to detect port scans and other suspect traffic.Port Scan Attack Detector project features a set of highly configurable danger thresholds (with sensible defaults), verbose alert messages, email alerting, DShield reporting, and automatic blocking of offending IP addresses.Psad incorporates many of the packet signatures included in Snort to detect various kinds of suspicious scans, and implements the same passive OS fingerprinting algorithm used by p0f. What's New in This Release: · SELinux policy files were added to make psad compatible with SELinux. · The files are located in a new "selinux" directory in the sources. · A bug was fixed in which local server ports were not reported correctly under netstat parsing. · A bug was fixed in the start() function in the Gentoo init script which caused psad to not be started and the error "* ERROR: psad failed to start" to be generated. · A bug that occurred when ENABLE_SYSLOG_FILE is enabled was fixed.

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