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Thank you for this great tutorial. I finished nearly all steps. However, I got error messages with openvpn, last lines:
...
Error: any valid address is expected rather than "dev".
Error: inet address is expected rather than "dev".
Error: inet address is expected rather than "dev".
Sun Dec 30 14:35:32 2018 Initialization Sequence Completed

I think this is related to the route-up.sh script where some variables $dev, $ifconfing_local etc... Do I have to replace them, too? I have played around a bit, but I am puzzled what I have to do here. I tried to replace them with fixed values and avoided error messages, but I'll end up not being able to access the internet. So I might not been correct by replacing these variables.