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public text v1 · immutable-A ssh_brute -m recent --set --name SSH --rsource
-A ssh_brute -m recent -j RETURN ! --rcheck --seconds 60 --hitcount 4 --name SSH --rsource
-A ssh_brute -m limit --limit 3/min -j LOG --log-prefix "SSH Brute Force Attempt: "
-A ssh_brute -p tcp -j REJECT --reject-with icmp-port-unreachable