I recently set up some rules. I know they could be abused for dos, but for me this is a minor problem. Warning: I am not sure if they work correct, or if they make some problems.
# SSH brute force protection $EXT_IF $IPTABLES -N ssh_brute $IPTABLES -A INPUT -i $EXT_IF -p tcp --dport 22 -m state --state NEW -j ssh_brute $IPTABLES -A ssh_brute -m recent --set $IPTABLES -A ssh_brute -m recent --update --seconds 120 ! --hitcount 4 -j RETURN $IPTABLES -A ssh_brute -m limit -j LOG --log-prefix "ssh bruteforce " $IPTABLES -A ssh_brute -j DROP
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