I have an Archer A5 router, with a repeater RE450. Now I have a Siemens PLC connected via Ethernet Cable to the RE450. Only I cannot access the PLC with my laptop connected to the Archer A5 router. I can if I make the repeater's Wifi a separate network, and then connect. It looks like some kind of isolation between the router and the repeater. But how can I fix this? I checked the Client Isolation settings under the Wifi Settings, but it's disabled.

Can anyone help me with this?