Huge thanks Till,
It is now a bit more clear to me, I will move the server and I will connect it directly to the modem, so I will have the 89.xx.xx.xx IP assigned to the server.
How can I set it up so I can have the same IP address for the website and for the ns1 and ns2, for the future I would like to host multiple domains .com and .eu.
Is there a link where this is described as for beginners?
As a second request would be if there is any tutorial how can I share internet on the second network card that I will install so I can pass the internet to the rest of my house.
wish you all the best.