Hi everyone. I finally found the problem if someone is interested.Oh no! Now I have a bigger problem I'm using Cyberghost with the app and the Wireguard protocol. When I connect to the VPN, it says connected but when I check my IP on https://ifconfig.co/ it still shows my normal public IP?! Do I have to change or update any network settings? Please help!
When I connect with the Cyberghost app through IKEv2 protocol, I can't access certain websites.
I have now installed Tunnelblick and it seems to work.
But does the Cyberghost app is looking for something on my patched Macbook what is somehow different and I can't properly connect via Wireguard? I mean the connection says connected and produces traffic. However, internet traffic isn't routed through it.
When using the Cyberghost VPN app and you connect via the Wireguard protocol, it doesn't automatically change under network settings -> TCP/IP -> IPv6 configuration to -> only link-local
When you change this to only link-local the public IP changes to the VPN when you check it e.g. on https://ifconfig.co/
I think this shows some of the limitations of using an unsupported OS. Hope this information helps maybe others.