Yeah, this is becoming ridiculous. franpa, maybe you should read up on basic TCP/IP configuration, and try to be a bit more structured with your reports. Looking at how chaotic your posts are, this thread could go on for all eternity.
To be a bit more helpful:
- Set ipx=true in dosbox.conf on _both computers_
- Decide which frigging port above 1024 to use, and use that one from now on, and no other!
- Open that port in the firewalls of all computers you want to have in your virtual network, and forward the port (TCP and UDP, just to be safe) to the computer running the server (probably through the router with which that machine connects to the internet). The client has to connect to the Internet IP of the server, or it's LAN IP if the client's inside your LAN
- Read the DOSBox readme for the _exact_ syntax of the network related commands. There's no damn ":" between the IP adress and the port number!
I didn't try DOSBox' IPX emulation myself yet, but from reading the readme, it all seems very obvious to me. If you have a friend that's been playing multiplayer games over the internet, he may be able to help you.