USB ethernet adapter support

[Ross Penner]

I have a USB ethernet adapter that doesn't seem to work out of the box
on my 10.0 system. I'm hoping somebody can help me figure out what
driver to load, or if there even is a driver available.

When I plug the device into the FreeBSD machine the only line on dmesg
is:
ugen4.2: <Linksys> at usbus4

It does work with my Ubuntu 14.04 system. I've added the dmesg output in
the hopes that it will be helpful:
[137513.415146] usb 1-1.5: new high-speed USB device number 6 using
ehci-pci
[137513.508489] usb 1-1.5: New USB device found, idVendor=13b1,
idProduct=0041
[137513.508493] usb 1-1.5: New USB device strings: Mfr=1, Product=2,
SerialNumber=6
[137513.508494] usb 1-1.5: Product: Linksys USB3GIGV1
[137513.508495] usb 1-1.5: Manufacturer: Linksys
[137513.508497] usb 1-1.5: SerialNumber: 000001000000
[137513.528939] cdc_ether 1-1.5:2.0 eth1: register 'cdc_ether' at
usb-0000:00:1a.0-1.5, CDC Ethernet Device, b4:75:0e:8f:5e:90
[137513.528960] usbcore: registered new interface driver cdc_ether
[137518.015729] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready