#include <a_samp>

public OnPlayerConnect(playerid)
{
    new ip[2][16];
    GetPlayerIp(playerid,ip[0],16);
    for(new i, m = GetMaxPlayers(), x; i != m; i++)
    {
        if(!IsPlayerConnected(i) || i == playerid) continue;
        GetPlayerIp(i,ip[1],16);
        if(!strcmp(ip[0],ip[1],true)) x++;
        if(x > 2) return Kick(i);
    }
    return 1;
}