More and more Notebooks are delivered with a NIC and perhaps a WLAN adapter.
When you want to use this in a docking-station or port-replicator, you must handle three NICs.
Here is the solution:
Copy the linux2.zip file in sys:\tftp directory from your NetWare PXE Server and overwrite the existing one. That's all!
For more information see this ZENworks Cool Solutions Article.