@terziyski The bedroom C6 has hardware 4.0, the dining room C6 has hardware 2.0. There must be a problem with the C6 4.0 since trying to do the same stuff with the 2.0 works fine without any...

@terziyski Thanks for your reply, I tried using different cables, diferent LAN port on the bedroom C6, and my laptop's ethernet port is perfectly fine. Also I checked and on both C6 the DHCP servers...

I have the following: ISP modem on house entrance where ISP internet comes from Archer C6 on dining room with Access Point Mode enabled the internet port of this router has a ethernet cable connected...