using Nokia C5-00 handset as an internet connection - looking for suggestions

[Arthur Marsh <arthur.marsh@internode.on.net>]

Hi, I've had a read and experiment with using a Nokia C5-00 handset as 
an internet connection and am stuck.

There are multiple options the mode of USB connection that the handset 
supports (PC Suite, mass storage, PTP transfer, media transfer and 
"Connect PC to web").

I tried "Connect PC to web" and experimenting with usb-modeswitch, but 
don't have a machine running MS-Windows to sniff what happens on this 
handset and try it under Debian GNU/Linux, and trying the same procedure 
listed for other Nokia devices didn't appear to do anything.

I also had a look at documentation for connecting another model of Nokia 
handset to a pc running Debian at:

http://wiki.maemo.org/USB_networking#Debian

If I chose the "PC Suite" option when plugging the USB cable in to the 
Nokia handset, I get the following in dmesg:

[49603.601267] usb 3-2: USB disconnect, device number 3
[53791.136629] usb 3-2: new high-speed USB device number 4 using ehci-pci
[53791.269646] usb 3-2: New USB device found, idVendor=0421, idProduct=0596
[53791.269660] usb 3-2: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[53791.269666] usb 3-2: Product: C5-00.3
[53791.269672] usb 3-2: Manufacturer: Nokia
[53791.269676] usb 3-2: SerialNumber: <deleted>
[53791.271387] cdc_acm 3-2:1.1: ttyACM0: USB ACM device
[53791.272771] usb 3-2: bad CDC descriptors
[53791.272885] usb 3-2: bad CDC descriptors

lsmod lists a bunch of new modules:

rndis_wlan             35123  0
rndis_host             12698  1 rndis_wlan
cdc_ether              12564  1 rndis_host
usbnet                 26748  3 rndis_host,rndis_wlan,cdc_ether
cfg80211              394809  1 rndis_wlan
rfkill                 18867  4 nfc,cfg80211,bluetooth
cdc_phonet             12793  0
phonet                 27725  1 cdc_phonet
cdc_acm                26225  0
mii                    12675  2 r8169,usbnet

usbpn0    Link encap:UNSPEC  HWaddr 
1B-3A-30-30-30-30-3A-30-00-00-00-00-00-00-00-00
          POINTOPOINT NOARP  MTU:65541  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

The handset already has a packet internet connection, but I'm at a loss 
as to how to configure usbpn0 and make it the default route, so that the 
mobile handset can be the internet connection for the pc and LAN.

Has anyone done this successfully?

Regards,

Arthur.