PortSentry v0.61beta is part of the Abacus Project suite of security tools. It is a program designed to detect and respond to port scans against a target host in real-time. There are other port scan detectors that perform similar detection of scans, but PortSentry has some unique features that may make it worth looking into: Runs on TCP and UDP sockets to detect port scans against your system. PortSentry is configurable to run on multiple sockets at the same time so you only need to start one copy to cover dozens of tripwired services. Stealth scan detection (Linux only right now). PortSentry will now detect SYN/half-open, FIN, NULL, X-MAS and oddball packet stealth scans. Four new stealth scan operation modes have been added to greatly increase the power of this package. PortSentry will react to a port scan attempt by blocking the host in real-time. This is done through configured options of either dropping the local route back to the attacker, using the Linux ipfwadm command,...
PortSentry v0.61beta is part of the Abacus Project suite of security tools. It is a program designed to detect and respond to port scans against a target host in real-time. There are other port scan detectors that perform similar detection of scans, but PortSentry has some unique features that may make it worth looking into: Runs on TCP and UDP sockets to detect port scans against your system. PortSentry is configurable to run on multiple sockets at the same time so you only need to start one copy to cover dozens of tripwired services. Stealth scan detection (Linux only right now). PortSentry will now detect SYN/half-open, FIN, NULL, X-MAS and oddball packet stealth scans. Four new stealth scan operation modes have been added to greatly increase the power of this package. PortSentry will react to a port scan attempt by blocking the host in real-time. This is done through configured options of either dropping the local route back to the attacker, using the Linux ipfwadm command, *BSD ipfw command, and/or dropping the attacker host IP into a TCP Wrappers host.deny file automatically. PortSentry has an internal state engine to remember hosts that connected previously. This allows the setting of a trigger value to prevent false alarms and detect "random" port probing. PortSentry will report all violations to the local or remote syslog daemons indicating the system name, time of attack, attacking host IP and the TCP or UDP port a connection attempt was made to. When used in conjunction with Logcheck it will provide an alert to administrators through e-mail.
