ethernet over usb

[hammack]

Has anyone tried to run ethernet over the usb port?  When I try connecting to my Motorola Surfboard cable modem via usb with my Slackware box, the modules usbnet, cdc_ether, rndis_host, and rndis_wlan show up and the device is seen as eth1.  I realize that the Sheeva Plug does not use modules, but these objects seem to be included in the kernel (Sources/linux-2.6.22.18).  But on the Sheeva Plug, all I get are these lines in /var/log/messages:

May 26 16:44:52 sheeva kernel: usb 1-1: new full speed USB device using ehci_marvell and address 2
May 26 16:44:52 sheeva kernel: usb 1-1: no configuration chosen from 1 choice

Am I missing something in the kernel or in the Ubuntu distribution?

                                                        Thanks,
                                                            Jim