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After setting up a VPN connection with gnome's NetworkManager I have noticed that OpenVPN is sending each few seconds some packets to my VPN server that I am not currently connected to:

02:33:00.802963 IP xxxxxxxxxxx.44167 > ec2-54-xxx-xxx-xxx.eu-west-1.compute.amazonaws.com.openvpn: UDP, length 53; Message Type: P_DATA_V1
02:33:00.872163 IP ec2-54-xxx-xxx-xxx.eu-west-1.compute.amazonaws.com.openvpn > xxxxxxxxxxx.44167: UDP, length 53; Message Type: P_DATA_V1
02:33:10.159852 IP xxxxxxxxxxx.44167 > ec2-54-xxx-xxx-xxx.eu-west-1.compute.amazonaws.com.openvpn: UDP, length 53; Message Type: P_DATA_V1
02:33:10.224316 IP ec2-54-xxx-xxx-xxx.eu-west-1.compute.amazonaws.com.openvpn > xxxxxxxxxxx.44167: UDP, length 53; Message Type: P_DATA_V1
02:33:20.328793 IP ec2-54-xxx-xxx-xxx.eu-west-1.compute.amazonaws.com.openvpn > xxxxxxxxxxx.44167: UDP, length 53; Message Type: P_DATA_V1
02:33:20.329198 IP xxxxxxxxxxx.44167 > ec2-54-xxx-xxx-xxx.eu-west-1.compute.amazonaws.com.openvpn: UDP, length 53; Message Type: P_DATA_V1

Any ideas why is it so ?

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