@riry I’m glad to hear that everything is back in order in your house. The dnsmasq solution is a solid one in that you don’t have to mess with your existing infrastructure if your current dhcp server doesn’t support dynamic pxe booting. Secondly if you power off your FOG server so dnsmasq is off line so no pxe boot info is sent out. As soon as the FOG server is back online so is PXE boot support via dnsmasq.
Well done getting everything working in your environment.