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DDoS

Distributed denial of service attacks (DDoS) are usually done by "bot nets"

A bot net is a network of compromised computers (that have a virus or trojan) that send random requests to a server the hacker wants to take down by overloading it with traffic.

Professional services filter DDoS traffic

Gigenet

Rack911

Discussion thread

How to prevent DDoS attacks

http://www.linuxsecurity.com/content/view/121960/49/

Everything that can and should be done

eg: Try using apf

See

Install a DDoS monitor

eg
ivankristianto.com/web-development/server/prevent-ddos-attack-with-mod_evasive-in-apache-2/1427/

It reports on DDoS activity and takes action immediately.

Sysctl

Another thing in the how to prevent DDoS attacks howto:

Implement Sysctl protection against DDOS



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