I made the changes but i still can’t access the internet over the guest. Eventually 
i have a wrong Config. Now the VPN also doesn’t work when i do the Normal Lan threw VPN.
Does the /root/openvpn-setup-script needs other Read/Write/Execute rights?
root@turris:~# ls -l /root/openvpn-setup-script
-rw-r–r-- 1 root root 326 Oct 15 08:22 /root/openvpn-setup-script
root@turris:~# cat /root/openvpn-setup-script
https://paste.laravel.io/4d189393-ba8a-4cb8-bbe4-2d518831461f
root@turris:~# cat /etc/config/network
https://paste.laravel.io/63779936-8c07-4ca1-bce7-e9b8e0cfeda4
cat /etc/config/openvpn
https://paste.laravel.io/08841139-36c5-496c-ae7e-ab360049b699
Thanks for the Help!
EDIT: My Logs
root@turris:~# cat /var/log/messages
https://paste.laravel.io/2d4c0213-e098-4919-8816-6ae1584fd743