I have played the windows port over IP on a LAN ...... i dont see why you could not do the same on a mac ?

Oh yeah and back in Marathon and Durandal days i would go over to a friends work on a Fri Night after everone had gone and we would Frag over the lan till the wee hrs of Sat Morning over Beer and Pizza ...... Running out the door b4 the weekend lab tech showed up @ 8 - back when a Quadra 840 was a hot machine ......... (they used one for a file server)

Marathon is open source now, and the data files were offered as free(as in beer)ware. Get it from http://trilogyrelease.bungie.org/
Marathon doesn't support TCP/IP gaming, though. You need an AppleTalk-in-TCP tunnel. Such a thing is created with NetLink Remote in combination with TCPSerial.

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