Absolutely required software for dDos attacks

Config Security & Firewall (CSF)

Absolutely the best software I’ve used to date, automatically detects a plethora of patterns and automatically adds the IP to the iptables block list.  Has lots of extra features for detecting malicious file activity and SU logins as well as some basic checks to make sure your configurations are secure.

Check it out at Config Server

Apache Mod_Evasive

Extremely effective and useful module for automatically blocking IP’s that request the same file very rapidly. If you need breach detection for your network, then you can click here to get the best services.

Mod_Evasive

SNORT Intrusion Detection

Very effective and useful tool to monitor everything thats going on in your system and track down potential attempted intrusions.

SNORT.org