itype rule option is used to check that a packet's ICMP type is less than, greater than, equal to, not equal to, less than or equal to, or greater than or equal to a specified integer value. This rule option can also check that an ICMP type is between a range of numbers, using the
<> range operator for an exclusive range check or the
<=> for an inclusive one.
# Check for an ICMP type greater than 30 itype:>30;