what should be limit to use for IPTABLE rate limiting for a webserver

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Posted by Registered User on Server Fault See other posts from Server Fault or by Registered User
Published on 2011-02-04T07:16:55Z Indexed on 2011/02/04 7:27 UTC
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I see on my webserver some logs as follows 

203.252.157.98 -   :25:02    "GET //phpmyadmin/ HTTP/1.1" 404 393 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :25:03    "GET //phpMyAdmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :25:03    "GET //pma/ HTTP/1.1" 404 388 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :25:04    "GET //dbadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :25:05    "GET //myadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :25:06    "GET //phppgadmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :25:06    "GET //PMA/ HTTP/1.1" 404 389 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :25:07    "GET //admin/ HTTP/1.1" 404 389 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :25:08    "GET //MyAdmin/ HTTP/1.1" 404 392 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :27:36    "GET //phpmyadmin/ HTTP/1.1" 404 393 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :27:42    "GET //phpMyAdmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :27:42    "GET //pma/ HTTP/1.1" 404 388 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 -   :27:43    "GET //dbadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"
203.252.157.98 - -    "GET //myadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro"

and some more as follows 

118.219.234.254 - - [19/Oct/2010:22:57:41    "GET /pma/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:22:57:41    "GET /scripts/setup.php HTTP/1.1" 404 397 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:22:57:42    "GET /sqlweb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:22:57:42    "GET /web/phpMyAdmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:22:57:43    "GET /web/phpmyadmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:22:57:44    "GET /web/scripts/setup.php HTTP/1.1" 404 400 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:22:57:44    "GET /webadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:22:57:45    "GET /webdb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:22:57:45    "GET /websql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:51    "GET /admin/phpmyadmin/scripts/setup.php HTTP/1.1" 404 407 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:52    "GET /admin/pma/scripts/setup.php HTTP/1.1" 404 404 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:52    "GET /admin/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:53    "GET /db/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:54    "GET /dbadmin/scripts/setup.php HTTP/1.1" 404 402 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:54    "GET /myadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:55    "GET /mysql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:55    "GET /mysqladmin/scripts/setup.php HTTP/1.1" 404 405 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:56    "GET /phpMyAdmin/scripts/setup.php HTTP/1.1" 404 405 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:56    "GET /phpadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:57    "GET /phpmyadmin/scripts/setup.php HTTP/1.1" 404 404 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:57    "GET /pma/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:58    "GET /scripts/setup.php HTTP/1.1" 404 397 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:58    "GET /sqlweb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:59    "GET /web/phpMyAdmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:38:59    "GET /web/phpmyadmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:39:00    "GET /web/scripts/setup.php HTTP/1.1" 404 400 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:39:01    "GET /webadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:39:01    "GET /webdb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
118.219.234.254 - - [19/Oct/2010:05:39:02    "GET /websql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"

I have 2 questions
1) When such an attack happens on my site then while such scanning is going on how do I detect it? (In a very less time)
2)I have decided to rate limit the IPTABLES so as to reduce such DOS attacks by some script kiddies (to scan for vulnerabilities in phpmyadmin or some other script) to some extent.So how much should it be limited so that genuine users do not get kicked out.What is the best practise for question 2?

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