--> Dead Peer Detection is a method used by network devices to verify existence or availability of other network devices in VPN technology.
--> By Default Dead Peer Detection is disabled on cisco devices, if it is enabled, it should be enabled on both the devices.
--> Once you enable Dead Peer Detection, the device will send R-U-There message to other device, if other device responds to message with Acknowledgement then VPN between two network devices will be active.
--> If the other device does not respond to Three R-U-There messages then the device which is sending the message will assume the peer is dead and VPN will be inactive.
--> By Default Dead Peer Detection is disabled on cisco devices, if it is enabled, it should be enabled on both the devices.
--> Once you enable Dead Peer Detection, the device will send R-U-There message to other device, if other device responds to message with Acknowledgement then VPN between two network devices will be active.
--> If the other device does not respond to Three R-U-There messages then the device which is sending the message will assume the peer is dead and VPN will be inactive.
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