Mod_Evasive is an open source evasive maneuvers system for Apache server to provide evasive action in the event of an HTTP brute force, Dos or DDos attack. It was designed to use as a network traffic detection and network management tool and can be easily configured and integrated into firewalls, ipchains, routers etc. Presently, it sends abuses…

Install Mod_Evasive

Step1:- Installing Dependencies
yum install gcc make
yum install libxml2 libxml2-devel httpd-devel pcre-devel curl-devel

Step2:--
cd /usr/src 
wget http://www.zdziarski.com/blog/wp-content/uploads/2010/02/mod_evasive_1.10.1.tar.gz
tar xzf mod_evasive_1.10.1.tar.gz
cd mod_evasive
apxs -cia mod_evasive20.c

Step3:--
By default installation adds the following line of mod_evasive configuration to your Apache configuration file. 
Please verify that it should be there like similar to below. If you can’t see this below line, then add this to your httpd.conf file.

LoadModule evasive20_module   /usr/lib/httpd/modules/mod_evasive20.so

Now add the mod_evasive configuration parameters to your Apache configuration at the end.

<IfModule mod_evasive20.c>
DOSHashTableSize    3097
DOSPageCount        2
DOSSiteCount        50
DOSPageInterval     1
DOSSiteInterval     1
DOSBlockingPeriod   60
</IfModule>

Next restart the Apache service to update changes.
/etc/init.d/httpd restart