@Alexandre. Once again. Thanks for a detailed plan of how to solve this. My primary Deco is connected to the Router given by the ISP, which also has other LAN ports for me to connect the satellite...

@Alexandre. Thanks a lot for you very helpful suggestions. You seem to be spot on about the problem being the cabling inside the walls. I didn't have a Gigabit card computer. The devices I have with...

I have 2 Deco X60 units connect via Ethernet using wall sockets in 2 different rooms. I have short ethernet cable running from port 2 of the Main unit to the wall socket (port 1 is connected to the...