Information Technology Resource posted a guide about installing and using SNORT on Ubuntu

I spoke about IDS (Intrusion Detection Systems) and IPS (Intrusion Prevention Systems) a few days ago in a question posted by a user. So I thought I would dive a little deeper into the subject with a specific application that I have personally used – Snort. Snort is a very powerful IDS that in later versions can act like an IPS. Snort is free to download and use in the personal enviornment as was as in the business environment. In fact Snort is used by many Enterprises as a very effective option for their business because not only is it free but it is one of the most powerful IDS’s out there is you know what you are doing when you configure it. Snort can be created as a program that you run when you want on a personal computer or it can be setup to run when your OS starts and protect all computers on your network from attacks.

  Installing and using SNORT on Ubuntu