Sharing LAN Internet: Use a “Virtual Router”

In my apartment I have a LAN (“cable”) internet connection. I recently got a second laptop which I would like to connect to the internet as well. Every attempt to do so failed, until an hour ago.

I cannot split the cable, because my MAC address is (uniquely) registered with my landlords (the internet connection can only be accessed by the computer with the registered MAC address). Also, my landlords forbid to use routers, so the LAN cable will have to be my access point. Continue reading