I have external Asus router and 5 Deco P9 behind it (in router mode). I have no problem connecting from Deco network to Asus but wise versa it doesn't work. I configured routing on Asus in next way:

Network: 192.168.68.0

Netmask: 255.255.255.0

Gateway: 192.168.1.245 (IP of main Deco)

Interface: Lan

But I still can't access Deco network. I found suggestion to switch Deco to AP mode that will disable NAT and I tried it. But in this mode I have almost zero visibility on Decos availability (some of them connected only via wifi/powerline so I need to see when they are offline) and many of my devices lost connection to internet. So I want to understand how can I disable NAT on Deco P9 while keeping it in Router mode.