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==Keepalives== To ensure that the connection between two endpoints has not been interrupted, endpoints exchange [[keepalive]] messages at regular intervals, which can also be used to automatically reestablish a tunnel lost due to connection interruption. <!-- merged from [[Dead Peer Detection]] --> Dead Peer Detection (DPD) is a method of detecting a dead [[Internet Key Exchange]] (IKE) peer. The method uses IPsec traffic patterns to minimize the number of messages required to confirm the availability of a peer. DPD is used to reclaim the lost resources in case a peer is found dead and it is also used to perform IKE peer failover. UDP keepalive is an alternative to DPD.
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