psad – Intrusion Detection and Log Analysis with iptables
psad is a collection of three lightweight system daemons (two main daemons and one helper daemon) that run on Linux machines and analyze iptables log messages to detect port scans and other suspicious...
View Articlefwknop – Port Knocking Tool with Single Packet Authorization
Port Knocking came about in around 2003, but it has various weaknesses. There are plenty of implentations though (some quite advanced). Most of the problems are fixed however by fwknop! fwknop stands...
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