Is it possible to setup Dead Peer Detection (DPD) on Cisco VPN client. If yes how it works?

Yes it is possible to setup Dead Peer Detection (DPD) on the Cisco VPN client (Cisco software client for connecting to remote VPN gateway). Cisco VPN Client sends its R-U-THERE message to a peer if it has sent traffic to the peer, but hasn’t received response back within ten seconds. This basically means that R-U-THERE messages are not sent if the VPN session is completely idle or the peer responds in a timely manner.

If the peer doesn’t respond with the R-U-THERE-ACK the VPN Client starts retransmitting R-U-THERE messages every five seconds until “Peer response timeout” is reached. After that the peer is declared dead.