MAC Address Pass-through Does Not Work on Dell Pro Thunderbolt Dock

Summary: Learn what to do if a Dell Pro Thunderbolt Dock’s MAC address pass-through does not work.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

A Dell Pro Thunderbolt Dock may not use the MAC address pass-through when IT policy has locked the computer MAC address on the network. When this happens, the dock LAN does not use the computer’s MAC address. It uses the dock’s MAC address, instead.

Affected Platforms:

  • Dell 14 Premium DA14250
  • Dell Pro 13 Plus PB13250
  • Dell Pro 13 Premium PA13250
  • Dell Pro 14 PC14250
  • Dell Pro 14 Plus PB14250
  • Dell Pro 14 Premium PA14250
  • Dell Pro 16 PC16250
  • Dell Pro 16 Plus PB16250
  • Dell Pro Max 14 MC14250
  • Dell Pro Max 14 Premium MA14250
  • Dell Pro Max 16 MC16250
  • Dell Pro Max 16 Plus MB16250
  • Dell Pro Max 16 Premium MA16250
  • Dell Pro Max 18 Plus MB18250
  • Dell Pro Rugged 10 Tablet RA00260
  • Dell Pro Rugged 12 Tablet RA02260
  • XPS 13 9350

Affected Docks:

  • Dell Pro Thunderbolt 4 Dock WD25TB4
  • Dell Pro Thunderbolt 4 Smart Dock SD25TB4
  • Dell Pro Thunderbolt 5 Dock WD25TB5
  • Dell Pro Thunderbolt 5 Smart Dock SD25TB5

Cause

The MAC address is obtained from the Intel Management Engine, but the computer’s MAC address is erased from the Intel Management Engine. This causes the MAC address pass-through from the dock to fail.

Resolution

Note: Before starting the update, perform the following:
  • Back up all personal data. For more information, refer to Back Up and Recovery.
  • Connect the AC adapter.

Updating the BIOS on the computer to the version listed below resolves the issue. To download and install the BIOS, refer to the BIOS Update Guide.

  • Dell 14 Premium DA14250: Version 1.10.0 or later
  • Dell Pro 13 Plus PB13250: Version 2.11.1 or later
  • Dell Pro 13 Premium PA13250: Version 2.11.1 or later
  • Dell Pro 14 PC14250: Version 1.16.5 or later
  • Dell Pro 14 Plus PB14250: Version 2.11.1 or later
  • Dell Pro 14 Premium PA14250: Version 2.11.1 or later
  • Dell Pro 16 PC16250: Version 1.16.5 or later
  • Dell Pro 16 Plus PB16250: Version 2.11.1 or later
  • Dell Pro Max 14 MC14250: Version 1.12.1 or later
  • Dell Pro Max 14 Premium MA14250: Version 1.8.1 or later
  • Dell Pro Max 16 MC16250: Version 1.12.1 or later
  • Dell Pro Max 16 Plus MB16250: Version 2.6.1 or later
  • Dell Pro Max 16 Premium MA16250: Version 1.8.1 or later
  • Dell Pro Max 18 Plus MB18250: Version 2.6.1 or later
  • Dell Pro Rugged 10 Tablet RA00260: Version 1.7.1 or later
  • Dell Pro Rugged 12 Tablet RA02260: Version 1.7.1 or later
  • XPS 13 9350: Version 1.19.1 or later

Affected Products

XPS 14 (Dell 14 Premium) DA14250, Dell Pro Max 14 Premium MA14250, Dell Pro Max 16 Premium MA16250, Dell Pro Max 16 Plus MB16250, Dell Pro Max 18 Plus MB18250, Dell Pro Max 14 MC14250, Dell Pro Max 16 MC16250, Dell Pro 13 Premium PA13250 , Dell Pro 14 Premium PA14250, Dell Pro 13 Plus PB13250, Dell Pro 14 Plus PB14250, Dell Pro 16 Plus PB16250, Dell Pro 14 PC14250, Dell Pro 16 PC16250, Dell Pro Rugged 10 Tablet RA00260, Dell Pro Rugged 12 Tablet RA02260, Dell Pro Thunderbolt 4 Smart Dock SD25TB4, Dell Pro Thunderbolt 5 Smart Dock SD25TB5, Dell Pro Thunderbolt 4 Dock WD25TB4, Dell Pro Thunderbolt 5 Dock WD25TB5, XPS 13 9350 ...
Article Properties
Article Number: 000386163
Article Type: Solution
Last Modified: 11 Aug 2026
Version:  7
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