block in proto icmp from any to any icmp-type echo pass in proto icmp from any to any icmp-type echo block in proto icmp from any to any icmp-type unreach code 3 pass in proto icmp from any to any icmp-type unreach code 3 block in proto icmp from any to any icmp-type echorep pass in proto icmp from any to any icmp-type echorep pass in proto icmp all icmp-type maskreq keep state pass in proto icmp all icmp-type timest keep state pass in proto icmp all icmp-type inforeq keep state |