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Hello I will check it in the morning at work but you should have Duken Nukem 3D\Network\Host and Client programs in the Menu Start that fixes IPC for you. Clients will needs to input IP of HOST and everything should work.
Checked: Please go to Menu Start\Duke Nukem 3d\Network\Start HOST game HOST then gives his IP number to other players Other players needs to choose Menu Start\Duke Nukem 3d\Network\Start CLIENT game then you should write in DosBox window CONNECT hoist.ip.number.here this open IPX tuneling and connects all the players, also all of the players needs to choose this same no of players for game.