5 -A INPUT -p icmp -j ACCEPT
6 -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
7 -A INPUT -i lo -j ACCEPT
8 -A INPUT -p tcp -j REJECT --reject-with tcp-reset
9 -A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
10 -A INPUT -j REJECT --reject-with icmp-proto-unreachable