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The xt_SYSRQ hash now includes the destination IPv4 or IPv6 address which makes it harder to replay a request to many different machines in the hope that some of them are using the same password.
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: "