How to block brute force attacks on your SSH server

You have probably seen very simple iptables rules to do this. This is a little bit better. -A INPUT -i eth0.103 -p tcp -m tcp –dport 22 -m state –state NEW -m recent –set –name SSH –rsource -A INPUT -i eth0.103 -p tcp -m tcp –dport 22 -m recent –rcheck –seconds 30 –hitcount 4 –rttl […]

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