I have a problem with my lan connection of my computer?

I've been a few days the problem that my laptop does not recognize the Lan, it is always either "unidentified" or "no Internet" out and Wi-Fi is not working well enough for my purpose.

Is the laptop right on the router or something in between, for example, a LAN distributor box

Yes he hangs on the lankabel which flows into a landose as far as I know directly on the router hangs

Then it may be that your Internet is lost because of the length trying to clamp a LAN amplifier between then it should run again