Maybe it's interesting for some of you, who might need an USB 2.0 Fast Ethernet Adapter which works on N4F.
Especially those of you who have only 1 NIC onboard and only 1 PCI Slot, which could be better used for a disk controller.
So...the DUB-E100 works like a charme.
Iperf gave me 95,1Mbps from 100.

