ICMP provides error reporting and network probe capabilities.
ICMP packets contain very short messages, there is no legitimate
reason for ICMP packets to be fragmented. If an ICMP packet is
so large that it must be fragmented, something has gone amiss.
With the ICMP Fragment Protection SCREEN option enabled, the device
should be able to block any ICMP packet with the More Fragments
flag set, or with an offset value indicated in the offset field.
This attribute counts the ICMP fragment packets.