The Cisco ASA must be configured to use Internet Key Exchange v2 (IKEv2) for all IPsec security associations.

In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types); organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. Use of IKEv2 leverages DoS protections because of improved bandwidth management and leverages more secure encryption algorithms.