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First Step towards DDOS mitigation

By apacheboosterblog ·
How to Prevent DDOS in cpanel server
DDOS Attack is one of the most dreaded attack in the internet world causing extreme headaches to the server admins world wide.
Distributed Denial of Service abbrevated as DDoS is a kind of attack towards a server and make a specific service unavailable for even genuine website visitors. DDOS is achieved by flooding the server with traffic from multiple sources.
The crackers(please dont misunderstand the term hackers, they are good guys) target a wide variety of websites, ranging from ecommerce website, news portals, banks, and this hovers as a threat towards availability of information and fascilities like online purchase and banking.
The most disheartening part is that there is no fool proof methodology to prevent DDOS in a perfect manner. We can mitigate the attack by numerous ways and some of them are costly

1.The best and the most widely used methodology is the hardware firewall by the Datacentre.

2.Install mod security which is an apache module.

3. Install dos evasive which is another apache module

4. Tweak kernel params to mitigate the current attack. The kernel parameters are tweaked by editing the file /etc/sysctl.conf
net.ipv4.tcp_syncookies = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
kernel.pid_max = 65536
net.ipv4.ip_local_port_range = 9000 65000
Above mentioned are some of the most commonly used sysctl settings. You may also tweak these values using the command : sysctl -w

5. Install ddos_deflat which is a bash script to block ips in case of large flooding beyond a threshold level.

6. Install Apachebooster : A popular Cpanel pluggin which will act as a first level of DDOS protection. As it aids in caching, it act as a method to prevent ddos.

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