This module matches on ICMP-specific fields.
.TP
.BI "--icmp-type " "TYPE"
ICMP Type. Has to be specified numerically.
.TP
.BI "--icmp-code " "CODE"
ICMP Code. Has to be specified numerically.
.TP
.BI "--icmp-id " "ID"
ICMP Id. Has to be specified numerically.