@David-TP Thank you for your answer. I'll try and see if it is my ISP router that issues addresses in the 192.168.0.x range. That however would mean that I have messed up my cabling which I of course...

I'm currently using three Deco M9 Plus and one Deco M5 in a mesh in AP mode and a separate modem / router connected to the Internet acts as DHCP server. That is working nicely but due to changes at...