@Solla-topee 

I've tried and below is my finding:

"Since our extenders are using smart DHCP, once it detected there would be another DHCP server and it would turn off its own server automatically"

• It seem to be a hit and miss, some of my extender seem to detect and some did not, while connected to the same router.

"And if you did not want to use the smart DHCP, there is a workaround: Manually configure the DHCP server on the extender"

• After setting and restart, it did not stop the DHCP server in the log. But manually toggling it between automatic (and save) and manual (and save) again, did finally stop the DHCP server.

So far the workaround method works for me, but hopefully (and preferably) in the future firmware update there will be a forced on/off feature.

@Solla-topee 

To add on, after a few restarts on the extender (RE300), the DHCP server auto started by itself even it was on a workaround setting. I have to toggle the auto (and save) and toggle (and save) again to stop it.

This seems to be a bug, I haven't restart the RE305 yet but can you please get your engineers to look into the issue in both devices?

I don't want to keep manually toggling the settings every time it self-started the DHCP server by itself.

Thanks.

1) The main router is Ubiquiti EdgeRouter ER-X

2) The system log stating "DHCP server started", and never stopped after that.

3) Yes, following the router VLAN gateway IP address and DNS server.

I've decided not to pursue this issue as it seems that even the log stating "DHCP server started", my devices are somehow connected with the IP address defined in my router's DHCP static IP map.