Weird question, I know. My apartment comes with a modern/router combo that, for whatever reason, does not have an Ethernet port. So a friend advised me to purchase a modem, then connect it via coax cable to my apartment’s modem/router, then connect that to my PC via cat5. I did so, but the Ethernet connection on my PC shows no Internet. Is this possible to set up? Is there a software related step I’m missing to complete the connections?
If you're in Europe, you can try arguing they are in violation of the EU open internet regulation, but it's unlikely to get you anywhere if you're not in the green-marked countries of the map below: https://fsfe.org/activities/routers/routers.en.html