| This extension can be used if `\-\-protocol icmp' is specified. It | |
| provides the following option: | |
| .TP | |
| [\fB!\fP] \fB\-\-icmp\-type\fP {\fItype\fP[\fB/\fP\fIcode\fP]|\fItypename\fP} | |
| This allows specification of the ICMP type, which can be a numeric | |
| ICMP type, type/code pair, or one of the ICMP type names shown by the command | |
| .nf | |
| iptables \-p icmp \-h | |
| .fi |