bandwidth usage
Here are some specs from Steam for a SRCDS.
Basically for internet connections (bits/second):
128K uplink = 4 players (2 players for srcds)
256k uplink = 7 players (4 players for srcds)
320k uplink = 9 players (6 players for srcds)
512k uplink = 14 players (9 players for srcds)
768k uplink = 21 players (14 players for srcds)
1024k uplink = 28 player (19 players for srcds - note 16 players is max for HL2DM)
1140k uplink = 32 players (max for HLDS) (21 players for CS:S)
1708k uplink = 32 players for CS:S (max)
Of course your particular line may or may not be stable enough to support the number
I have listed there. Local players on LAN are not included in this count.
A good rule of thumb for HLDS is 35.6Kbits per player.
A good rule of thumb for SRCDS (CS:S and HL2DM) is 53.4KBits per player (about 1.5x more then HLDM).
Certain maps and MODs may take more uplink bandwidth too.
This maxplayers setting also assumes you are running the following server rate limits (in the server.cfg file):
//minimum rate allowed
// use 5000 for SRCDS Servers
sv_minrate 3500
// no limit on maxrate for LAN only use 7500 for regular server
// this controls how fast maps can be downloaded by clients
//sv_maxrate 0 = unlimited
// Use 9999 for SRCDS servers
sv_maxrate 7500
// this is the minimum playable updaterate, leave this at 13
sv_minupdaterate 13
// 60 for updaterate is LAN ONLY use 13 for internet
// 20 is default but will cut the maxplayers you can handle in 1/2
// for SRCDS Servers use 30 - you might be able to use 20
// sv_maxupdaterate 60
sv_maxupdaterate 13
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