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3.7 Null Modem Link

You can use Chestnut Dialer to connect two computers via null modem cable. On the first computer create following account:

Redial Forever: on
Redial Auto: on
Authentication Type: Terminal
Use Script: None
Ask Password: off
Local IP Address: 192.168.5.1
Netmask: 255.255.255.0
Remote IP Address: 192.168.5.2
Dial Device: /dev/ttyS0
Use the Modem Control Lines: off
Add Default Route: off
PPP Options: passive

On the second:

Redial Forever: on
Redial Auto: on
Authentication Type: Terminal
Use Script: None
Ask Password: off
Local IP Address: 192.168.5.2
Netmask: 255.255.255.0
Remote IP Address: 192.168.5.1
Dial Device: /dev/ttyS0
Use the Modem Control Lines: off
Add Default Route: off
PPP Options: passive

Note: if you connected to LAN, make sure that you don't use same network numbers (see ifconfig(8)).

The dial device must match the serial port that you use (where cable is connected). For Linux:

COM1 - /dev/ttyS0
COM2 - /dev/ttyS1
COM3 - /dev/ttyS2
COM4 - /dev/ttyS3