i have a qeustion for you guys who know more then me,k when i serve on multi player i can only serve for 4 people without lag,k now i have a AMD 1 gig,512 k,32 nividia tnt card and last but not least a bloody brodband connection.......i should be able to host more ,i know in other games like DF2 i can host 16 no probs.
any suggestions to my problem would be gratfully recived

Run a dedicated server.

Upload cap is what will restrick you.
A 320k upload cap you should be able to handle up to 8 peeps

good luck

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Not so Rude,
RudeDog
http://www.landi.net/rd.jpg