A TP-Link W8980 acts as a DHCP server on 192.168.0.0/24 subnet. This is also the only wifi access point.

A Zyxel USG 50 is connected to it through its 2 WAN ports and has static addresses 192.168.0.253 and 192.168.0.254

The Zyxel also acts as a DHCP server on 192.168.1.0/24 for the devices connected through its 4 LAN ports.

Is there any way to make the Zyxel the only DHCP server and create a unique 192.168.1.0/24 subnet, also for the devices connected to the TP-Link via wire or wifi?

I already tried to bridge WAN1 and LAN on the Zyxel and this way I can make the TP-Link to act as the only DHCP server, but this is not exactly what I want (and, furthermore, I lose the possibility of doing traffic balance on the 2 WAN ports of the Zyxel)

EDIT: I've made this simple image to better explain the situation. The desired result is that all the devices (wired or wifi) are on the same subnet

[![Desired result](https://i.stack.imgur.com/h1fSq.png)](https://i.stack.imgur.com/h1fSq.png)