среда, 15 сентября 2010 г.

000webhost борется с DDos

Сегодня отвалился хостинг, чего ранее не наблюдалось.
Вот, что обнаружил в CPanel:



Server #20 is under the DDOS attack (IP Nullrouted)
We have just received a HUGE (over 3GB/s incoming traffic) DDoS attack targeting the Server #20 . Our CISCO guard firewall was unable to handle such attack, so one of the server IP address - 64.120.212.93 was disabled (all the rest websites on this server are working fine).

If your website is using this IP (due to unique IP rotation system only 3% websites are using this IP) it will be unavailable for the next 6 hours. As soon attack will subside, this IP address will be enabled and your website will start working again. We thank you for your patience and understanding.





Хоть я висел и на другом IP, в эти 3% все равно попал и вот почему (с форума хостера):




I finally figure it out!

Admin has been saying this all along but I just did not realize what he is saying until today!

Due to security measure 000webhost admin introduce a security measure where your site ip that you see in your cpanel is not the exact ip that you would use when you use external domain name service or redirecting domain name service.

This is very important to remember when you decide not to use 000webhost name servers.

YOU MUST add 1 to your IP that you get from your cpanel.

For example:
Server Name server25.000webhost.com
IP Address 216.108.235.136

NOTE: the working IP would be: 216.108.235.136 +1

Then you would enter 216.108.235.137 as an IP of your site to your external domain service. Create a A record with this IP.

I tried this technique with several domain name service paid or free and they all work just fine given that you give it enough time to propagate across internet.

Enjoy!
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Each server has 32 IPs in order to mitigate DDOS attacks (you can use any of these 32 IPs excecpt the main IP). So if DDOS attack strikes we only nullroute 1, attacked, IP and only ~3% of websites goes down instead of whole server.




В общем поменял IP в сервисе DNS в A записи, и все зашуршало.

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