I am having major trouble getting my Deco system to backhaul using ethernet cable. My system starts with a BE25 Deco hardwired to my modem. I will call this the master Deco. The Master Deco communicates wirelessly with two other BE25 Deco units and seems to be ok. (The system is set to router mode). I have an ethernet cable running from the remaining LAN port to another Deco unit - Model W3600; then from the remaining LAN port on this unit to another DECO W3600 Deco unit. I can't get the ethernet to backhaul from the Master unit to the W3600 satellitte units. I have tried practically everything. My cables are good (I have tested them for continuity), but they just won't connect in the wired mode.What am I doing wrong?