4. Using USB Modem with Linux

4.1. Requirements

Modern Linux distribution with the USB CDC ACM class support in the kernel (either built-in or as

module cdc-acm.ko) is required.

4.2. Installation

Unzip the USB Modem archive anywhere on your Linux computer. Install USBModem.prc in the Treo

RAM (not a card) using a HotSync or by other means.

4.3. Setting up a PPP Connection

1. Obtain the user name, password and dial number from your wireless provider. For GSM

networks the access point name (APN) is also required.

2. Copy either ppp-script-edge-template (for GSM GPRS/EDGE networks) or ppp-script-evdo-

template (for CDMA 1xRTT or EvDO networks) file from the USB Modem distribution to

/etc/ppp/peers/ppp-script-treo (you may need to create the path manually), replacing the

USERNAME and APN (for GSM only) words with the correct values.

3. Add the user name and password line from the pap-secrets-template to the /etc/ppp/pap-

secrets file, replacing the USERNAME and PASSWORD words with the correct values.

4. Test the connection.

See the drivers/linux/mts folder for the complete pppd example scripts tuned up for the MTS GSM

operator.

4.4. Connecting via USB

First of all, configure the Linux PPP connection as described in the Setting up a PPP Connection

section above.

To connect your Treo using a USB cable to the Linux computer, start the USB Modem application on

the Treo, set the Connectivity method to USB and enable the modem mode. Now type in the

command prompt:

bash-2.05# pppd /dev/ttyACM0 call ppp-script-treo

It will print how the connection setup is performed. If it was successful a new network interface will be

created (usually ppp0). The only thing left is to copy the content of /etc/ppp/resolv.conf to system-wide

/etc/resolv.conf for proper name resolution:

bash-2.05# cat /etc/ppp/resolv.conf > /etc/resolv.conf

Note: for some newer Linux distributions (such as Fedora Core 3) do the following instead of the above

step:

bash-2.05# ln -s /var/run/ppp/resolv.conf /etc/resolv.conf

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