[iSteve]

one method is to check their IP and then set a limit,
lets suppose

Код:

#define MAX_CONNECTIONS_FROM_IP 5
new pip[MAX_PLAYERS];
public OnPlayerConnect(playerid)
{
       GetPlayerIp(playerid,pip[playerid],16);
	new num_players_on_ip = GetNumberOfPlayersOnThisIP(pip[playerid]);
	if(num_players_on_ip > MAX_CONNECTIONS_FROM_IP) 
       {
	    Kick( playerid );
	    return 1;
	}
}


stock GetNumberOfPlayersOnThisIP(test_ip[])
{
	new ip_count;
        for(new i;i<MAX_PLAYERS;i++)
        {
	if(!strcmp(pip[i],test_ip)) ip_count++;
	return ip_count;
        }
}