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I'd recommend getting the MAC Address using WMI and then using that value with the NetCardAddress Setting in the unattend.txt. To get the Mac Address use the MacAddress property from the Win32_NetworkAdapterConfiguration object) You can then insert this value directly into your unattend.txt like below: NetCardAddress=00:00:00:00:00 And when you use the NetCardAddress Setting, you don't have to use the PCI Bus, Device, and Function Number settings to distinguish which card you are using. Good Luck! captcalc