limit_conn_zone $binary_remote_addr zone=perip:10m;
limit_conn perip 100;

limit_req_zone $binary_remote_addr zone=dynamic:10m rate=2r/s;
limit_req zone=dynamic burst=10 nodelay;

server {
.....................
location / {

....................................
}
}

server {
limit_conn_zone $binary_remote_addr zone=perip:10m;
limit_req_zone $binary_remote_addr zone=dynamic:10m rate=2r/s;

location / {
limit_conn perip 100;
limit_req zone=dynamic burst=10 nodelay;
}
}

limit_zone slimits $binary_remote_addr 5m;

$binary_remote_addr

CREATE TABLE `all_visits` (
`ip` varchar(15) DEFAULT NULL,
`date` int(11) DEFAULT NULL,
INDEX (`date` Desc)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

<?php
if (!empty($_SERVER['HTTP_CLIENT_IP']))
$ip=$_SERVER['HTTP_CLIENT_IP'];
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
else $ip=$_SERVER['REMOTE_ADDR'];
$bot=$_SERVER['HTTP_USER_AGENT'];

if (strstr($_SERVER['HTTP_USER_AGENT'], 'Yandex')) {$bot='Allowed_bot';}
elseif (strstr($_SERVER['HTTP_USER_AGENT'], 'Google')) {$bot='Allowed_bot';}
elseif (strstr($_SERVER['HTTP_USER_AGENT'], 'Yahoo')) {$bot='Allowed_bot';}
elseif (strstr($_SERVER['HTTP_USER_AGENT'], 'Mail.Ru')) {$bot='Allowed_bot';}
elseif (strstr($_SERVER['HTTP_USER_AGENT'], 'Bing')) {$bot='Allowed_bot';}

if ($bot!='Allowed_bot') {

$link=mysql_connect("IP-адрес-MYSQL","Login_mysql","Password_mysql") or die("Could not connect: ".mysql_error());
mysql_select_db("ИМЯ_БД", $link);

$result=mysql_query("INSERT INTO all_visits (ip,date)
VALUES ('".$ip."','".time(true)."')");
$result=mysql_query("SELECT count(1) FROM all_visits
WHERE (ip='".$ip."' and date>'".(time(true)-5)."')", $link);
$count_visit=mysql_fetch_array($result);

if ($count_visit[0]>30) {
$file_htaccess=".htaccess";
$start_line=0;

$lines=file($file_htaccess);
for ($n=0; $n<=count($lines)-1; $n++) {
$lines_htaccess[]=$lines[$n];
if ($lines[$n] == "<Limit GET POST> \r\n") {
$lines_htaccess[]=$lines[$n+1]; //order allow,deny
$start_line=$n+2;
break;
}
}

if ($start_line!=0) {
$lines_htaccess[]=" deny from ".$ip."\r\n";
for ($n=$start_line; $n<=count($lines); $n++) $lines_htaccess[]=$lines[$n];
} else {
$lines_htaccess = $lines;
$lines_htaccess[]="<Limit GET POST> \r\n";
$lines_htaccess[]=" order allow,deny \r\n";
$lines_htaccess[]=" deny from ".$ip."\r\n";
$lines_htaccess[]=" allow from all \r\n";
$lines_htaccess[]="</Limit> \r\n\r\n";
}

file_put_contents($file_htaccess, $lines_htaccess);
}
}
?>

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www.)?sait.ru [NC]
RewriteRule .(mp3|mp4|swf|rar|zip)$ http://www.sait.ru

<script src="jquery.js"></script>

<script language=JavaScript>

function show()
{
url_target="123.php"+'?' + new Date().getTime();
$.ajax({
url: url_target,
cache: false,
success: function(html){
$("#content").html(html);
}
});
}

$(document).ready(function(){
show();
setInterval(function() {
show();
},1000);
});
</script>

<div id="content"></div>

<?php

$server = "****.mysql";
$db_user = "*****_mysql";
$db_pass = "*****";
$db = "******";
$to_secs = 600;


$t_stamp = time();
$timeout = $t_stamp - $to_secs;

mysql_connect($server, $db_user, $db_pass) or die ("Useronline Database CONNECT Error");
mysql_db_query($db, "INSERT INTO CJ_UsersOnline VALUES ('$t_stamp','$REMOTE_ADDR','$PHP_SELF')") or die("");
mysql_db_query($db, "DELETE FROM CJ_UsersOnline WHERE timestamp<$timeout") or die("");
$result = mysql_db_query($db, "SELECT DISTINCT ip FROM CJ_UsersOnline WHERE file='$PHP_SELF'") or die("");
$user = mysql_num_rows($result);
mysql_close();

if ($user == 1){
echo "$user";
}
else{
echo "$user";
}
?>

CREATE TABLE CJ_UsersOnline (
timestamp int(15) NOT NULL default '0',
ip varchar(40) NOT NULL,
FILE varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),
KEY FILE (FILE)
) TYPE=MyISAM