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