Triggers when a IP datagram is received with the protocol field of the IP header set to 1 (ICMP) and the type field in the ICMP header set to 12 (Parameter Problem on Datagram).ICMP Parameter Problem datagrams may be used to bypass packet filter security policies as they are rarely filtered in either incoming or outgoing traffic. May be used to perform denial of service attacks. No known exploits incorporate this option. This does not preclude the possibility that exploits do exist outside of the realm of Cisco Systems knowledge domain.
No recommended filters.
ICMP Parameter Problem datagrams are issued when a router has had to drop a datagram because it was malformed. This is a normal and necessary type of network traffic. Large numbers of this datagram type on the network are indicative of network difficulties or may be indicative of hostile actions.
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