gistfile1.txt

# Local and established are just fine
-A INPUT -i lo -j ACCEPT
-A INPUT -d 127.0.0.0/8 ! -i lo -j REJECT --reject-with icmp-port-unreachable
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

# SSH Rate Limiting
-I INPUT -p tcp --dport 22 -m state --state NEW -m recent --set
-I INPUT -p tcp --dport 22 -m state --state NEW -m recent --update --seconds 60 --hitcount 3 -j DROP

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

# Pings
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT

# To hell with the rest
-A INPUT -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -j REJECT --reject-with icmp-port-unreachable
-A OUTPUT -j ACCEPT