Enterprise Multi-WAN VPN QoS Router
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Dead Peer Detection (DPD): If this option is selected, the connected VPN tunnel will regularly
transmit HELLO/ACK message packet to detect whether there is connection between the two
ends of the VPN tunnel. If one end is disconnected, the device will disconnect the tunnel
automatically and then create new connection. Users can define the transmission time for each
DPD message packet, and the default value is 10 seconds.