- #60 = Client Identifier (set to "PXEClient")
- #66 = Boot Server Host Name
- #67 = BootFile Name
Important: Microsoft does not support the use of these options on a DHCP server to redirect PXE clients
For a PXE server to respond to a PXE request, the request must be able to transverse routers to communicate with PXE servers on other subnets. PXE uses the DHCP option fields to pass information. Therefore having the PXE server in the routers IP helper table helps make sure that the DHCP packets are forwarded to the PXE server so the PXE server can respond correctly.
PXE uses the following to determine which offer to use:
- DHCP/Bootp in same offer
- DHCP with IP only Proxy Boot Servers, such as Remote installation services (RIS) and ADS.