@Kevin_Z I use my router as the main DHCP server connected to a TP-link mediaconverter. It's NOT set in Access Point Mode. I enable/disable "allow guests to access my local network" last night from...

The option "allow guests to access my local network", doesn't work like expected. It seems like it works the other way arround. I can't see their Chromecast devices, but they can see mine and cast to...