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#14557 Is this DDOS attack?

Posted in ‘Admin Tools for Joomla! 4 & 5’
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Environment Information

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Latest post by nicholas on Saturday, 05 January 2013 08:28 CST

Saturday, 05 January 2013 04:30 CST

user6558

Mandatory information about my setup:

Have I read the related troubleshooter articles above before posting (which pages?)? No
Have I searched the tickets before posting? No
Have I read the documentation before posting (which pages?)? No
Joomla! version: (unknown)
PHP version: (unknown)
MySQL version: (unknown)
Host: (optional, but it helps us help you)
Admin Tools version: (unknown)

Description of my issue:

My server is loading 100% cpu, and I run server command to check: netstat -anp |grep ‘tcp|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort –n

found that there are 300 connections to my server. One of the IP has 73 connection. Is this IP doing DDOS attack to my server?

http://screencast.com/t/tWE5sDPhY5ut

Saturday, 05 January 2013 08:28 CST

nicholas

It's definitely not DDoS. DDoS means distributed denial of service attack. By definition it means several IPs (usually in the hunderds or thousands) attacking your site in unison. 300 connections is not a lot, really. Plain old DoS it could be, especially considering that the IP comes from China and it seems to be consuming a quarter of your current open connections.

I would recommend installing mod_security2 or mod_evasive to your Apache web server, with a good ruleset which will prevent this kind of simple to avoid attacks.

Nicholas K. Dionysopoulos

Lead Developer and Director

🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!

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