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Null Modem PPP Connection with your Palm

This shortly describes how to get your Palm online via a so called null modem cable. Your cradle or Hotsync-cable will work just fine for this purpose. There is no special cable needed.

I have tested this myself with a Palm m515 (serial, not USB!), IIIc and IIIxe. It should also work for III, IIIx, IIIe and the like. The oldest PalmOS Version I used was 3.5, I'm not sure whether older version can do the same.

On the server side you need a PC with Linux installed. You need root access and pppd installed on your machine. If you are using a dialup or DSL connection you most likely already have that installed. Almost every current Linux should do the trick, I have tested it on a 2.4 system but 2.2 should work as well.

Configuration of your Palm handheld

Go to the Launcher's system tab and start the program called "Prefs".
Select the "Connection" item in the upper right list
Create a new connection.

Name: Nullmodem
Connect to: PC
Via: Serial
Go to the detailes tab

Set the speed to 115200 bytes per second
Flow control automatic
OK

OK, now the new connection should be in the list of available connections.

Select "Network" in the upper right list.
Create a new network service

Go to the menu and select "New"
Name: PPP
User name: none (empty field)
Password: prompt
Connection: Nullmodem (the one you created)
Go to the details screen

Connection Type: PPP
Idle timeout: Never (it does not cost anything anyway...)
Query DNS: Yes
IP Address: Automatic
To to the scripts tab

The very first item should be "End". If you set this all the other lines should be deleted (if there are any)
OK

Now you are set on the palm side

Server / Linux side Open a root shell and execute the following command:

/usr/sbin/pppd /dev/ttyS0 115200 192.168.77.1:192.168.77.2 noauth silent local persist -detach

This will launch the PPPd for the first serial port on ttyS0 (on Windoze this is called COM1). You should see a message like this:

Using interface ppp0
Connect: ppp0 <--> /dev/ttyS0

Now connect your Palm with the serial cable to the first serial port and click on "Connect" in the Network settings tab on your Palm (where you created the network connection, you still should be there :-). You should see messages on the Linux screen indicating that a connection has been establised. Your Palm should get the IP 192.168.77.2 and the server has 192.168.77.1. You should be able to ping your Palm from the Linux PC.

To get online with you Palm you have to masquerade the traffic. Let's assume you are behind a router and connected to the network with eth0.

First you need to enable network forwarding. Type:

echo 1 > /proc/sys/net/ipv4/conf/all/forwarding

Then establish masquerading for your palm by typing

/sbin/iptables -t nat -A POSTROUTING -s 192.168.77.0/24 -d ! 192.168.77.0/24 -o eth0 -j MASQUERADE

Now your palm should be able to reach the outside world.

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