Hi Erich
It will be interesting if you can explain a little bit of what you want to do.
I had tried on VirtualBox eCS VM guest (Windows host) with USB to test some USB webcam, USB mouse, USB flash drives and other USB devices connected on the host. But I never thought on testing (and I don't have) a USB-Ethernet device, since on the virtual machine you can use the host's NIC to access the network.
Do you want to separate how the Guest eCS-OS/2 VM connects to the network from the host machine? Is there any specific reason to do that? Or it is only to test the device to be sure it can run on a stand alone eCS-OS2 real machine hardware?
Regards.