@Ebarlev In the first scenario, when the VR600 is in 'wireless router mode' you should use only LAN4/WAN port to connect to your fiber router LAN port. In the second scenario, when VR600 is in 'DSL...

@sabujp I was mislead by the device specifications, sorry about that. You should have WAN aggregation option indeed - it is described in your A20 user guide - Chapter 4.5. Now the issue that you may...

@Bob111 Have you tried with the prefix fd12:3456:789a::/64 Here some details on unique local address.

@sabujp Archer A20 doesn't support WAN link aggregation (Archer A20 specs): "Static Link Aggregation (LAG) available with 2× LAN ports"

@xDaniels AX series routers have prooved not being WDS friendly and because a cable connection between routers would be much more stable and faster. Of course if running a cable is not possible you...

@xDaniels There's nothing more you can do except running a cable between the routers and set C6 in AP mode (Case 1).