Apache 1.3 and 2.0 Flood/DoS/DDoS Protection with mod_dosevasive (Avoiding Denial of Service Attacks)
With the widespread infection of many computers with viruses, and the ever increasing number of Botnets, DoS and DDoS attacks can be quite frequent and can very easily bring a website to halt for days. This article provides a module solution for apache to help mitigate small http DoS and DDoS attacks.
Download the latest version of mod_dosevasive from: http://www.nuclearelephant.com/projects/dosevasive
The lastest version is 1.10 (http://www.nuclearelephant.com/projects/dosevasive/mod_dosevasive_1.10.tar.gz)
tar zxvf mod_dosevasive_1.10.tar.gz
Change into the directory:
Compile mod_dosevasive apache module (Apache 2):
/usr/local/apache/bin/apxs -i -a -c mod_dosevasive20.c
or the following for apache 1.3:
/usr/local/apache/bin/apxs -i -a -c mod_dosevasive.c
Replace /usr/local/apache with your path to apache.
Edit your httpd.conf (usually located in /usr/local/apache/conf/httpd.conf):
DOSSystemCommand “su – someuser -c ‘/sbin/… %s …’”
- DOSHashTableSize: is the size of the table of URL and IP combined
- DOSPageCount: is the number of same page requests from the same IP during an interval that will cause that IP to be added to the block list.
- DOSSiteCount: is the number of pages requested of a site by the same IP during an interval which will cause the IP to be added to the block list.
- DOSPageInterval: is the interval that the hash table for IPs and URLs is erased (in seconds)
- DOSSiteInterval: is the intervale that the hash table of IPs is erased (in seconds)
- DOSBlockingPeriod: is the time the IP is blacked (in seconds)
- DOSEmailNotify: can be used to notify by sending an email everytime an IP is blocked
- DOSSystemCommand: is the command used to execute a command when an IP is blocked. It can be used to add a block the user from a firewall or router.
- DOSWhiteList: can be used to whitelist IPs such as 127.0.0.1
Although mod_dosevasive can be quite effective in some cases, in others it can cause more problems by blocking non-offending IPs. It is suggested you take a look at hardware solution if you
Similar Articles : How to install ffmpeg on CentOS or Redhat Enteprirse Linux the easy way (Using RPMs/Yum) , Installing Pico on FreeBSD, Turck MMCache for PHP, Apache 2 Install and Upgrade Guide, lingerd – Setup and Installation, Howto mod_rewrite with Apache, Getting started with SSH Tutorial, How to install PRM (Process Resource Monitor), How to install ionCube loader, Apache Log Files Explained, Server Loads Explained, Guide to .htaccess tutorial and tips, Optimize and Tweak High-Traffic Servers, Common SSH Commands – Linux Shell Commands, Upgrade Guide From Red Hat 7.3 to 9.0,Changing Web Hosts? Step-By-Step Guide, Customizing PHP Safe Mode, Apache 2 PHP 4 and 5 (mod_php) on Linux – Apache2 PHP4 PHP5 Installation, Fantastico Error: enc_restrictions.inc.php is protected by SourceGuardian and requires file ixed.lin.4.X.X.pxp, 4.3.7.pxp, 4.3.8.pxp, 4.3.9.pxp error, How to Copy Files Across a Network/Internet in UNIX/LINUX (Redhat, Debian, FreeBSD, etc) – scp tar rsync, Fixing rndc error in WHM/cPanel: rnd: connection failed: connection refused, wget – how to use tuturial, cPanel Awstats Fix – Stoped Logging on single domain, How to Install Zend Optimizer/Encoder on cPanel/WHM, Upgrading CentOS 3.3 to 3.4 using yum, Redhat 7.3, 8.0, and 9.0 upgrade to CentOS 3 using yum (Red hat), Tutorial/HOW-TO: Kernel 2.6 Compilation with Grsecurity (grsec) – 2.6.5, 2.6.7, 2.6.8, 2.8.1, 2.6.9, 2.6.10, 18.104.22.168 , Repairing a mySQL Database/Table – How to restore/repair/recover, Flood Protection/DoS/DDoS Apache 1.3 and 2.0 – mod_dosevasive (Avoiding Denial of Service Attacks)