If you have a system or network connected to the Internet, you become a target. Your network is being scanned for vulnerabilities. This may happen only once a month or twice a day, regardless, there are people out there probing your network and systems for weaknesses. This documentation will show how you can protect yourself by installing an Intrusion Detection System with free available Software (Snort, PHP, MySQL, ACID) on a Linux Mandrake 9.2 System
Read more and download the complete documentation here.