I am not able to PXE from the USB to Ethernet adapter -> 443-BBBD.
I have also tried the Dell - Thunderbolt docking station - GigE - 180 Watt -> 450-AFIX.
I have both of the Realtek USB controllers in the boot image -> rtu30x86w7.inf and rtu86w7.inf (using an x86 boot image). The Dell e6420, 7440, 7450 and 7470 all work with a standard cat-6 connection.
I am able to get past the network boot F12 option, WIM drivers load but am not getting an IP. I tested this with the F8 option and ipconfig /all during the WIM process.
I am also not able to PXE boot. I am using Dell USB to Ethernet adapter > p/n 0TFXX8 (LAN7500)
I am imaging Win 7 Enterprise x64. I have the drivers in the boot.wim
I have legacy enabled in the BIOS version 1.0.1
I try to get around this by using a hub with a boot winPE on USB connected and my LAN7500.
During WinPE I 'F8' and ipconfig to find I have no IP?
Did you try to update the BIOS?
Bios is current - 1.2.2. Thank you for idea.