As soon as a VPN connection is established, a lock icon with connected plugs is shown in the panel:
However, this only serves as an indicator. To be sure that the VPN connection really exists:
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Open a Local Terminal.
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Run the command
ifconfig. -
Check whether the output contains a
tundevice with an IP address from the private network.
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Additionally, check whether you can ping the VPN server's private IP address.