Serial Over IP is a tool for the transport of serial interfaces over UDP/IP. It is very usefull for connecting distant equipment that run via a serial interfaces to a local computer.
One linux will be server and one will be client. On the server you can start the program typing the following command:
bash# serialoverip -d /dev/ttyS0 9600-8n1 -s 127.0.0.1 3000
... and on the client:
bash# serialoverip -c 127.0.0.1 3000 -d /dev/ttyS1 9600-8n1
In both commands the IP address is the server IP. Note that you have to start the server first, and it will be efectively be running only after the first packet received from the client.