Nowadays everyone from the IT field thinks about security. There are many tools in the market that provide web security. Someone provides a hardware firewall and another one provides software or online WAF services like Cloudflare, Foregenix but these are paid tools. So let’s talk about a free toll who can provide security for example DDoS attack. It’s a common attack performed by hackers. So we will install and configure mod_evasive with Apache which is used to Prevent Against DoS & DDoS attack.
Install And Configure mod_evasive With Apache
Install mod_evasive module
To install the mod_evasive module on RedHat / CentOS, enter the following:
sudo yum install mod_evasive
The mod_evasive module reads its configuration from /etc/httpd/conf.d/mod_evasive.conf. Which may be easily customized. Don’t need to create a separate configuration file. Because there are not any rules to update during a system upgrade.
The default mod_evasive.conf file has the subsequent directives enabled
<IfModule mod_evasive20.c> DOSHashTableSize 3097 DOSPageCount 2 DOSSiteCount 50 DOSPageInterval 1 DOSSiteInterval 1 DOSBlockingPeriod 10 </IfModule>
You can change these values according to the amount and type of traffic that your web server needs to handle.
a. DOSHashTableSize: This specifies how mod_evasive keeps track of who is accessing what. Increasing this number will provide a faster lookup of the web sites that the client has visited earlier.
b. DOSPageCount: This specifies how many identical requests to a specific URI a visitor can make over the DOS Page Interval interval.
c. DOSSiteCount: This is the same as DOSPageCount, but corresponds to how many requests overall a visitor can make to your website over the DOSS interval.
d. DOSBlockingPeriod: If a visitor exceeds the limits set by DOSSPageCount or DOSSiteCount, their IP would be blocked during the DOSBlockingPeriod amount of time. During this time, they will receive a 403 (Forbidden) error.
One of the most important configuration options you have to change is DOSEmailNotify. If this is enabled email will be sent to the specified email address when the IP address is blacklisted.
You can do it by editing the mod_evasive.conf file.
# sudo nano /etc/httpd/conf.d/mod_evasive.conf
Un-comment the DOSEmailNotify line by removing the # in front of the line, and change the email address to your own
DOSEmailNotify [email protected]
Save and close the file and restart Apache to reflect the changes.
# sudo apachectl restart
Note: You need to have a functioning mail server on this server for this email alert to work.
Now you are able to know that how to Install And Configure mod_evasive with Apache this module use to prevent against DoS & DDoS attack. For Apache, mod_security configuration use this link.
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