Filtering ICMP traffic
This option allows configuring an ACE to selectively permit some types of ICMP traffic, while denying other types. An ACE designed to permit or deny ICMP traffic can optionally include an ICMP type and code value to permit or deny an individual type of ICMP packet, while not addressing other ICMP traffic types in the same ACE. As a further option, the ACE can include the name of an ICMP packet type.