Thanks for the reply. I did that and I lost parental control which is a problem for me. I need a solution where Deco can refer DHCP server running on my modem/route (read any external DHCP Server)...

Can I configure Deco M4R to use DHCP server running on the router it is connected to? they are running latest Firmware 1.4.3 Build 20200918 Rel 74289. Currently, Deco is running is its DHCP server...