If a DHCP server is running on the Windows Deployment Services server, Windows Deployment Services must be configured to ...

If a DHCP server is running on the Windows Deployment Services server, Windows Deployment Services must be configured to not listen on port 67 and DHCP Option Tag 60 must be added to all DHCP scopes on your DHCP server. Non-Microsoft DHCP servers require manual configuration of DHCP option tag 60.