Android tethering

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What is Tethering

Tethering is a way to have Internet access on your PC through your smartphone using it's network connection. Usb and wifi access point tethering is natively supported from Android Froyo ( 2.2 ). Older versions of the Android OS, mostly unofficial roms have this option enabled.

Wifi access point

Since Froyo ( Android 2.2 ), wifi access point ( use 3G ) is accessible by default, without the need to root the phone. Moreover, this method will not discharging battery too fast like USB. See : menu/wireless & networks/Internet tethering/Wifi access point

USB tethering

Tools Needed

  • Root access to the PC ( for old Androids, Froyo ( Android 2.2 ) can do it natively )
  • Usb connection cable from your phone to pc

Procedure

  • Disconnect your pc from for current wifi or ethernet network
  • Connect the phone to your pc using the usb cable
  • Enable the the tethering option from your phone. This is usually done from

Settings --> Wireless & Networks --> Internet tethering

(The following step may not be needed. usbnet module may not be necessary, do it only if you don't see a usb0 interface in the ifconfig step)

  • Load the usbnet module(if it's not already loaded). You will need root access to do that
modprobe usbnet
  • Make sure that the usb interface is recognized by the system by using the following command
ifconfig -a

you should be able to see a usb0 device listed like this(notice the usb0 device):

root@arch:~# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:16:36:FA:3E:31  
          UP BROADCAST MULTICAST  MTU:1500  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:1000 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:316435 errors:0 dropped:0 overruns:0 frame:0
          TX packets:316435 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:22875193 (21.8 Mb)  TX bytes:22875193 (21.8 Mb)

usb0      Link encap:Ethernet  HWaddr C2:5A:11:8D:43:F5  
          BROADCAST MULTICAST  MTU:1500  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:1000 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)


  • Configure the new network device via dhcp using the following command
ifconfig usb0 up && dhcpcd usb0

To stop the network sharing, issue the command

dhcpcd -x usb0

USB tethering with openvpn

This method works for any old Android version and does not requires root access nor modifications in the phone (it is also suitable for Android 2.2 and later, but no longer required).

It does not requires changes to your browser; in fact transparently handles all network traffic for any PC application (except ICMP pings). It is somewhat CPU intensive in the phone at high usage rates (a 500 kbyte/sec data transfer rate may take more than 50% of phone CPU in a powerful Acer Liquid).

Tools Needed

In Arch you need to install the openvpn package. Is is also required the Android SDK installed (which can be obtained here). In the phone, the azilink application, a Java-based NAT that will communicate with OpenVPN in your computer.

Configuring the phone connection in Arch Linux

Once installed the Android SDK, in order to use the provided tools your phone must be properly setup in udev and your linux user need to be granted rights. Otherwise you may need root privileges to use the Android SDK, which is non recommended. To perform this configuration, turn on USB debugging on the phone (usually in Settings -> Applications -> Development -> USB debugging), connect it to the PC by the USB cable and run the lsusb command. The device should be listed. Example output for the Acer Liquid phone:

Bus 001 Device 006: ID 0502:3202 Acer, Inc. 

Then, create the following file, replacing ciri by your own Linux user name, and 0502 by the vendor ID of your own phone:

Template:File

As root run the udevadm control restart command (or reboot your computer) to make the change effective. Now run in your linux PC the adb shell command from the Android SDK as plain (non root) user: you should get a unix prompt in your phone.

Procedure

Run the AziLink application in the phone and select "About" at the bottom to receive instruccions, which basically are:

  1. You'll have to enable USB debugging on the phone if it was not already enabled (usually in Settings -> Applications -> Development -> USB debugging).
  2. Connect the phone with the USB cable to the PC.
  3. Run AziLink and make sure that the Service active option at the top is checked.
  4. Run the following commands in your linux PC:
    1. As plain user: adb forward tcp:41927 tcp:41927 (requires Android SDK installed)
    2. As root: openvpn AziLink.ovpn

Template:File

Tethering with proxy

With this method tethering is achieved by port forwarding from the phone to the pc. This is suitable only for browsing. For firefox, you should set network.proxy.socks_remote_dns to true in about:config ( adress bar )

Tools Needed

  • Root access to the PC
  • Android SDK which can be obtained here
  • Usb connection cable from your phone to pc
  • Proxoid application(free download from the Android market)


Instructions

Follow the instructions demonstrated in the following link