I have a Mac Server setup to reimage my Mac Clients and it has been working great since 10.9.
My server environment is primarily windows with the exception of a few Mac servers (Imaging, Printing, and Caching). I have a windows server that runs DHCP and has a small range setup for reimaging. The clients used to get an IP in this range, however, since upgrading the Mac Server to 10.12 they are getting an IP address outside the DHCP range and causing IP conflicts. It just seems to pick a random IP.
My DHCP range is 192.168.17.130 - 192.168.17.160. The Macs are getting IP's like 192.168.17.83 (which is already allocated to another device on the network). My DHCP server is not showing any mention of the Mac client, and it also has lots of available IP's to lease.
I do not have DHCP server turned on, on any of my Mac Servers.
As you could imagine it is causing the reimage's to go really slow and act strange.