1 :INPUT,FORWARD,OUTPUT 2 -p icmp -m icmp --icmp-type any;=;OK 3 # output uses the number, better use the name? 4 # ERROR: cannot find: iptables -I INPUT -p icmp -m icmp --icmp-type echo-reply 5 # -p icmp -m icmp --icmp-type echo-reply;=;OK 6 # output uses the number, better use the name? 7 # ERROR: annot find: iptables -I INPUT -p icmp -m icmp --icmp-type destination-unreachable 8 # -p icmp -m icmp --icmp-type destination-unreachable;=;OK 9 # it does not acccept name/name, should we accept this? 10 # ERROR: cannot load: iptables -A INPUT -p icmp -m icmp --icmp-type destination-unreachable/network-unreachable 11 # -p icmp -m icmp --icmp-type destination-unreachable/network-unreachable;=;OK 12 -m icmp;;FAIL 13 # we accept "iptables -I INPUT -p tcp -m tcp", why not this below? 14 # ERROR: cannot load: iptables -A INPUT -p icmp -m icmp 15 # -p icmp -m icmp;=;OK 16