I am using a three pack of Deco M5's to extend mynetwork.  However, I have a different brand router as my main gateway to the internet and other services such as DNS and DHCP.  So, the M5's are in bridge mode.

Today I was doing some maintenance and my router was offline at times.  During these times, the M5's started giving out addresses through DHCP.  In bridge mode, there is no ability to control anything DHCP on these devices.  Is there any way to turn off all DHCP through these things?  It caused a mess on my network.