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we restart the VPN connection by sending a special signal to the OpenVPN client:
# killall -USR1 openvpn
This will trigger a “soft-reset” of the OpenVPN client.
Soft-resets occur in real-life situations mostly when the persist-tun option is used on the client side and an OpenVPN client is on a mobile network with roaming, or whenever the network between the client and the server is not very stable.
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Mastering OpenVPN