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Reported-by: Sergei Zhirikov <sfzhi@yahoo.com> References: http://marc.info/?l=netfilter-devel&m=131404939007827&w=2
PSD (Portscan Detection) External extensions for Xtables-addons Example: iptables -A INPUT -m psd --psd-weight-threshold 21 --psd-delay-threshold 300 --psd-lo-ports-weight 1 --psd-hi-ports-weight 10 -j LOG --log-prefix "PSD: "