> you should actually move everything behind the Deco if you want proper guest network isolation. And if you can put your isp modem or router in bridge mode, as suggested by Kevin _Z, that would be...

Thanks for replying @Glassman1976 ! The topology is exactly as you described it. Do you know if there's an easy workaround to get what I want? If the Deco supported custom firewall rules it'd be just...

I've got a single Deco M5 (V3, firmware 1.3.2 Build 20190624 Rel. 59384), connected to the host network (192.168.1.x) via an ethernet cable. Clients on the Deco Guest WiFi network (192.168.68.x) can...