I'm not sure that this is directly connected to the DisplayLink Ethernet driver. Our driver is layer 2 only and just passes Ethernet packets between USB and the Windows Ethernet stack. If you can ping the DNS servers, but they are not resolving the name, the problem is probably somewhere in the Windows network stack or in the network security.
It sounds like you are using this in a business. Is there some network security that will prevent unrecognised MAC addresses (which the dock will be) from resolving host names to prevent them getting network access?
Wim
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