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Dead-Peer-Detection
IKEv2 dead-peer-detection used for return routability checks and to verify addresses
If indirect notification, start with currently in use address
If direct notification start with most preferred address
Send some DPD packets, if no reply move to next address
Keep same IKEv2 message id
Every time new address is tried the retranmission timers are reset
If no response the IKE SA is dead => delete
PPT Version