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Source: markdown

configure:

$ sudo iptables -A INPUT -p tcp --dport 22 -m recent --rcheck --seconds 60 --hitcount 2 --name SSH -j LOG --log-prefix "SH "
$ sudo iptables -A INPUT -p tcp --dport 22 -m recent --update --seconds 60 --hitcount 2 --name SSH -j DROP
$ sudo iptables -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --set --name SSH -j ACCEPT

2 try, 60 sec delay

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