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Article Number: 000124383

PXE boot DHCP server requirements for Dell XPS, OptiPlex, Latitude, Precision computers shipping after 2019

Summary: The following article provides information about reports of a PXE boot issue on the latest computers from Dell. It is an issue where the DHCP server is sending out the older undionly.kpxe file as our new computers no longer support legacy boot. This file can prevent the server from accessing the IP address of the new Dell XPS, Latitude, OptiPlex, or Precision device. ...

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Article Content

Symptoms

 

New Dell computers with no legacy boot option may fail to PXE boot

 

This may be caused by the Dynamic Host Configuration Protocol (DHCP) server being configured for legacy support instead of Unified Extensible Firmware Interface (UEFI).

Using the traditional Legacy Pre-Boot Execution Environment (PXE) boot, the DHCP server offers the client computer undionly.kpxe. In return the computer accepts it, gains an IP address, and the PXE boot begins. However, when UEFI is the only boot option in the BIOS, the DHCP server needs to offer an .efi file instead.


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Cause

This is because all Dell business computers built and shipped since 2019 and forwards will ship with only UEFI boot support.

Note: These computers are working as designed. UEFI has become the new standard for boot, and Dell will not support legacy boot for PXE on our new computers moving forwards.


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Resolution

Windows - The wdsmgfw.efi file should be offered instead of undionly.kpxe.
Linux - The ipxe.efi file should be offered instead of undionly.kpxe.

On most DHCP servers, you can eliminate the need for the server to distinguish between the UEFI and legacy by doing the following:

  1. Configure the Internet Protocol-helpers (IP-helpers) to forward the DHCP requests to all the DHCP and WDS/PXE hosts.

  2. Remove any option 66 and option 67 definitions on your DHCP servers.

  3. If Windows Deployment Services (WDS) runs on the same server as your DHCP:

    1. Mark the checkbox in WDS to not use DHCP port.

    2. Mark the checkbox to set the PXEClient DHCP option.

SLN321127_en_US__2WDS_Configuration_BK

(Figure.1 WDS Configuration)


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Article Properties

Affected Product
OptiPlex, XPS, Latitude, XPS, Fixed Workstations, Mobile Workstations, Latitude 7200 2-in-1, Latitude 3300, Latitude 5300 2-in-1, Latitude 5300, Latitude 7300, Latitude 3400, Latitude 5400, Latitude 5401, Latitude 7400 2-in-1, Latitude 7400 , Latitude 3500, Latitude 5500, Latitude 5501 ...
Last Published Date

21 Jul 2021

Version

7

Article Type

Solution

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