Thursday, November 13, 2008

HTC Diamond as a Rndis Modem (GPRS/EDGE/HSDPA)

Using HTC Diamond as a Rndis modem

Hi, after a small amount of investigation I have finally got the HTC Diamond working as a Rndis modem over the USB port.

What this means is that you can use the Internet connection sharing function of the Diamond to get a computer onto the Internet using the H or G phone data connection.

Please note that the first steps of this guide will work for any ACTIVESYNC connected HTC phone that has the Connection Sharing (it's in the Connection Manager on other HTC phones)

Obviously using data on your mobile costs money so be aware of this and make sure you have a package that has reasonable charges.

finally I have only tested this on an ORANGE HTC Diamond in the UK.

The reason you have to modify the source is that if you don't the rndis fails with an error like (this is seen in the /var/log/syslog)


[355.215268] rndis_host 5-3:1.0: dev can't take 1558 byte packets (max 1536)

you need a working internet connection to set this up

1. Install Pre-requisites
2. Get the Source
3. Modify the source (Diamond only)
4. Compile and make and install
5. Start the Internet Connection Sharing
6. Plug in the Phone (USB)

Once you have done steps 1-4 you will only ever need to do steps 5 & 6 to get re-connected.

Step 1 - Install Pre-requisites

open a terminal (use same terminal in next steps)


$ sudo apt-get install subversion

Step 2 - Get the Source


$ svn co
cd usb-rndis-lite/

Step 3 - Modify the source (Diamond only)


$ gedit rndis_host.c

on line 524, find this bit


if (tmp <>hard_mtu) {
"dev can't take %u byte packets (max %u)\n",
dev->hard_mtu, tmp);
goto fail;

change it to this


if (tmp <>hard_mtu) {
"dev can't take %u byte packets (max %u)\n",
dev->hard_mtu, tmp);
retval = -EINVAL;
/* goto fail;*/

save the file

Step 4 - Compile and make and install


$ make
$ sudo ./
$ sudo make install

Step 5 - Start the Internet Connection Sharing

On OLD Tytn II's open Comm Manager on your phone and click on the Internet Sharing Now make sure USB is selected and choose connect

On Diamonds it's a seperate program called Internet Connection Sharing

Step 6 - Plug in the Phone (USB)

Plug the phone in, once the Phone has a data connection the Internet connection sharing will say connecting, then connected.

If this takes a while the dhcp may timeout and you will have to run the following command.


$ sudo dhclient

You should then see that you have an ip on the rndis device


$ ifconfig

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