@Kjell_Arne From your description it seems like you have ethernet connectivity issue only with devices connected to the two switches. If a wired device is connected directly to the router then...

@SinisaR The reason for this behaviour could be the switch between MR6400 and PC0 or the PC0 itself (its firewall settings). If you can ping MR6400 from PC1, there's no reason you can't ping the PC0,...

@RobLB You probaly meant the AX90 model. The mandatory requirement to use two routers in mesh is one of them to support Easymesh. If both routers support Onemesh they can't build a mesh network -...

@RobLB By the way, if you won't use the mesh feature you can switch it off and these hidden SSIDs should disappear:

@djwoodyuk It's recommended that you have only one DHCP server in your local network when using RE700X in RE mode. When you setup RE700X did you disable its DHCP server ? If you didn't, try that and...

@Ciaran211 Yes, you can. For that purpose you'd need an ATA adapter and a SIP account with your ISP.