i would like to make my own server but i dont know what i need, i have a second computer (just some old pentium) but what else do i need, i was told i need to eithernet cards for it, and does the second computer have to be any good?
You need a fast internet connection. Basically if you dotn have an ethernet card you dont have a very fast connection. Try using a T1-T3. The cpu will only need to be able process lots of info so most people will go with Fast Processor and Lots of RAM.
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Forgive me Father, for I will sin.
It really depends on how fast your internet connection is on the upload. If you have a ~300K upload limit as is the case with most dsl or cable modems then you could get by with a PII 300 or so and around 192 Megs of ram for a dedicated server. I have tested several configs but this is about the minimum. This will let you host around 8 players with no lag. Go above 8 players and you will get lag from your internet connection.
If you have a faster connection, T1-T3 or faster then you can host a ton of players but you will need a much faster computer. A PIII 800 with 512 megs of ram will run dedicated for 25 players but much over that and it becomes laggy. Not because of network speed but because the processor is running at around 80% and if you get someone in the game with a sub-par connection speed the processor spikes and lags everyone. If you could go as high as 1GHz or higher you should have no problem and if the processor is that fast you could probably get by with less ram but nothing less than 256.
Hope this helps, I have tried several configs and this is what works with no lag. I know others will say you could probably host 20 people on a PII 300 but that is not going to happen without pauses and lag.
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Quit crying and just die already!