1 block in proto icmp from any to any icmp-type echo
2 pass in proto icmp from any to any icmp-type echo
3 block in proto icmp from any to any icmp-type unreach code 3
4 pass in proto icmp from any to any icmp-type unreach code 3
5 block in proto icmp from any to any icmp-type echorep
6 pass in proto icmp from any to any icmp-type echorep