1 This extension is loaded if `--protocol icmp' is specified. It 2 provides the following option: 3 .TP 4 .BR "--icmp-type " "[!] \fItypename\fP" 5 This allows specification of the ICMP type, which can be a numeric 6 ICMP type, or one of the ICMP type names shown by the command 7 .nf 8 iptables -p icmp -h 9 .fi 10