My Cloud internet access via Ethernet


since I am living in a student dormitory I am not allowed to install my own router :confused:

But! Besides the wifi I have an ethernet jack in my wall that provides my computers perfectly fine with internet access.

You can guess my question: Is it possible to get the wall-ethernet-internet-connetion to my server? Which settings (ports?!) do I have to use at the manual setup? It wont connect automatically.
Maybe the problem is that I have to log in with user data before internet access is enabled to a new device. Is there a way to tell the cloud this log in data?

Hope there is any solution, I need to access the server via cloud at Christmas holiday.

Thank you!