Configuring MAC address cloning or MAC address pass-through

Configuring MAC address cloning or MAC address pass-through

You can configure the MAC address of the DisplayLink Ethernet port from various sources. These sources are listed in the priority order they will be applied below:

1. Selected OEM laptop with dock MAC address passthrough on available configuration. You may reach out to technical support for details.
2. MAC address set per Ethernet adapter interface under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\XXXX with a string value of NetworkAddress and a value in the format XXXXXXXXXXXX, where X is a hex digit between 0.
3. MAC address set underHKEY_LOCAL_MACHINE\System\CurrentControlSet\services\dlcdcncm\Parameters\ with a string value of MacAddressOverride and a value in the format XXXXXXXXXXXX, where X is a hexadecimal digit between 0 and F.
4. Automatic wired/wireless MAC address cloning / pass-through
5. Default MAC address of the dock hardware is used

Option 2 is should be the chosen option for an IT manager to implement MAC address passthrough. This can be used in conjunction with a script to obtain a MAC address from a location on the PC, and ensure that MAC address is always used for a DisplayLink Ethernet connection. An example Windows Powershell script, which gets the MAC address of first Ethernet interface found on the PC and sets it in the registry can be downloaded here. Note that the script needs to be run with administrator privileges, so it can write to the Windows registry.

IT managers need to be careful when choosing and configuring their MAC address passthrough policy that more than one interface with the same MAC address cannot be connected to the same network at the same time. Having duplicate MAC addresses on a network will cause network issues.