@MrNiceMesh 

Hi,

Could you please help me check the following information:

1. When you noticed it was functioning like a router, what is the operation mode on the APP, wireless router or access point?

2. Could you please help me check the network map of the whole internet system: like ISP—cable modem router—main DHCP server(LAN IP range 192.168.xxx.xxx?)—main Deco---other Decos；

(please also mark out how the Deco units are connected to each other, Ethernet backhaul, or wireless backhaul?)

Thank you very much.

@MrNiceMesh 

Good day,

Thank you very much for your kind reply.

We have several feedbacks recently, Deco would still enable its DHCP server even on AP mode When it failed to detect the main router’s DHCP server.

And there is a temporary workaround shared by one of our customers:

Modify the subnet mask of the main router and LAN IP address on the Deco, such as 192.168.8.1/255.255.248.0 on the main router, Deco 192.168.9.1,

so that even though Deco activated its own DHCP server, it is still within the IP range of the home router;

https://community.tp-link.com/en/home/forum/topic/172846?replyId=530756

Please feel free to update here with further improvement.

Thanks a lot for your understanding.

@MrNiceMesh 

Good day.

Thank you very much for your kind reply.

We do have a plan to add a separate switch on the Deco to turn off the DHCP server on the further firmware.

Thanks a lot for your time and patience.

Your understanding would be highly appreciated.