PXE с WDS & Windows Server 2012 - никакая опция имени файла в арендном договоре DHCP?

PXE uses DHCP. You can run PXE on a network with separate PXE and DHCP servers, but PXE does need to listen on DHCP. It just can't hand out IP addresses.

It kind of goes like this:

PXE Client:  DHCPREQUEST, p.s. I'm a PXE Client.
DHCP Server:  DHCPACK, Here's your IP! p.s., PXE over there ->
PXE Server:  DHCPACK, Hello, I'll be your PXE server today...

So you're going to need to make changes to the DHCP server (to specify to PXE clients where to get PXE services) and possibly the routers as well (to specify the PXE server as a DHCP helper).

I don't have access to the environment where I had this working because I've switched jobs since then, but here are some suggested DHCP scope options:

Predefined Option 43 - 010400000000FF
Custom-made Option 60 - String - PXEClient
Predefined Option 66 - IP or Hostname of the WDS Server
Predefined Option 67 - boot\x86\wdsnbp.com

I got these here: http://social.technet.microsoft.com/Forums/windowsserver/en-US/e84c8a4c-a6da-4c4a-8ca6-2a1007b205ae/wds-server-and-dhcp-server-on-two-different-servers

Good luck!