I got the problem that I am unable to acces internet through our ethernet cable. The cable is plugged in the main internet source and connected to the RPI.
When I connect this cable on the same way as discribed above and plug it in a pc I have internet acces.
The strange thing is that the RPI can see the ehternet cable and shows his IP addres with ifconfig, but I cant ping it.
Thnx for the reply but I already succeed in connecting to the internet.
The problem was that I had a static connection with a router wich didn’t had acces to the internet. This probably causes the problem that i couldn’t connect to the ethernet. I made it manual again and after that I could connect with the ethernet cable to internet.