IPX emulates classic network situation when one computer works like a server and others are clients and connect to the first one.
User interface allows you to enable or completely disable IPX support.
In the user interface you have to set your device like a server and fill the udp port. Then you need tell
others your IP address (it's in server title or in game Advanced Settings). To obtain your IP address you must be
connected to network.
You can set server manually in expert settings with this line :
ipxnet startserver [UDP port]
For example : ipxnet startserver 2000
Client
Clients can connect after the server is turned on. Obtain IP address from server device and fill it in configuration.
This can be done manually with this line :
ipxnet connect IP Port
For example : ipxnet connect 192.168.0.1 2000
Of course you need to do additional stuff in the game itself. You need configure whether you are server or client.