N900 USB networking

Revision as of 19:18, 26 January 2010

This page describes how to enable Networking on the N900 via USB. The first part describes how to configure the Nokia N900 as a USB pluggable network device. The second part describes how to configure various platforms to use the Nokia N900 as a network device. This article is based on the Maemo 4.x wiki for configuring USB networking.

You might want to use the N900 as a USB network device to log into your N900 remotely, or to transfer data from your N900 to another computer, in a situation where wifi or bluetooth are not an option. If you wish to connect your N900 to a Linux machine over TCP/IP, the PC connectivity section in the Maemo SDK documentation also contains useful information.

1 N900 USB network configuration
- 1.1 Starting USB network mode
- 1.2 Stopping USB network mode
2 Host USB Network Configuration
3 Automatic configuration with ubuntu 9.10
4 Using the usb networking for maemo apps

N900 USB network configuration

There is a default USB network interface configuration on Nokia N900. In the file /etc/network/interfaces, you should see a section which looks like this:

auto usb0
iface usb0 inet static
       address 192.168.2.15
       netmask 255.255.255.0
       gateway 192.168.2.14

With this default configuration, the N900 USB interface will have the IP address 192.168.2.15, and the remote end will have the IP address 192.168.2.14. By default, the USB network interface on the N900 is configured

Starting USB network mode

Plug one end of the USB cable on the host and the other end into the N900. The N900 will bring up the mode-selection dialog. Select 'PC Suite mode'.

Open a root shell in 'X Terminal' on the N900 and activate the interface by executing the following:

sudo gainroot
ifup usb0

If all went well, no errors will be displayed. The command 'ifconfig usb0' will give the following output:

Nokia-N900-42-11:~# ifconfig usb0
usb0      Link encap:Ethernet  HWaddr F2:50:8F:04:1D:8B  
          inet addr:192.168.2.15  Bcast:192.168.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1021 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2003 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:86091 (84.0 KiB)  TX bytes:2556598 (2.4 MiB)

You should also be able to ping 192.168.2.15

Nokia-N900-42-11:~# ping 192.168.2.15
PING 192.168.2.15 (192.168.2.15): 56 data bytes
64 bytes from 192.168.2.15: seq=0 ttl=64 time=0.367 ms
64 bytes from 192.168.2.15: seq=1 ttl=64 time=0.214 ms
^C
--- 192.168.2.15 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.214/0.290/0.367 ms

If you can not ping the outside world (for example: local network works but Google does not), check your routing tables.

/home/user # route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     *               255.255.255.0   U     0      0        0 usb0
default         192.168.2.14    0.0.0.0         UG    0      0        0 usb0
default         *               0.0.0.0         U     0      0        0 gprs0

If you have a situation like above where the cell network's packets are at a lower default priority, you might have to run the following to fix it:

/home/user # route del default
/home/user # route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     *               255.255.255.0   U     0      0        0 usb0
default         *               0.0.0.0         U     0      0        0 gprs0
/home/user # ping google.com
PING google.com (74.125.45.103): 56 data bytes
64 bytes from 74.125.45.103: seq=0 ttl=51 time=257.081 ms
64 bytes from 74.125.45.103: seq=1 ttl=51 time=236.481 ms
64 bytes from 74.125.45.103: seq=2 ttl=51 time=256.226 ms
^C
--- google.com ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 236.481/249.929/257.081 ms

Stopping USB network mode

This is optional. It is not necessary to stop the interface after unplugging the USB cable.

However, to stop the USB interface, unplug the USB cable and execute the following in 'X Terminal'

sudo gainroot
ifdown usb0

Host USB Network Configuration

The Host configuration is detailed in the Maemo 4.x USB Networking wiki. Please refer to it for details.

Automatic configuration with ubuntu 9.10

Note: this instructions should be fixed/improved:

Create the file in /etc/udev/rules.d/99-nokia-n900.rules and put in the following lines:

SUBSYSTEM=="net", ACTION=="add", ENV{ID_USB_DRIVER}=="cdc_ether", ENV{ID_MODEL}="N900__PC-Suite_Mode", ENV{ID_VENDOR}=="Nokia", NAME="n900"
SUBSYSTEM=="net", ACTION=="add", ENV{ID_USB_DRIVER}=="cdc_phonet", ENV{ID_MODEL}="N900__PC-Suite_Mode", ENV{ID_VENDOR}=="Nokia", NAME="n900pn"

the edit /etc/network/interfaces and add:

auto n900
iface n900 inet static
	address 192.168.2.14
	netmask 255.255.255.0
	up iptables -A POSTROUTING -t nat -s 192.168.2.15/32 -j MASQUERADE
	up echo 1 > /proc/sys/net/ipv4/ip_forward
        down iptables -D POSTROUTING -t nat -s 192.168.2.15/32 -j MASQUERADE
	down echo 0 > /proc/sys/net/ipv4/ip_forward

finally you have to fix /etc/init/network-interface.conf, change the line:

stop on net-device-removed INTERFACE=$INTERFACE

with:

stop on net-device-remove INTERFACE=$INTERFACE

You have to reload udev rules with:

udevadm control --reload-rules

Now put your usb cable in the pc and in the n900.

Using the usb networking for maemo apps

By default standard network apps works well with usb networking, while maemo specific apps not.

Install libicd-network-null from extras devel, and when usb networking is up pickup "Dummy network" from the connection manager.

Retrieved from "http://wiki.maemo.org/N900_USB_networking"

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