"Is it better to run your company's firewall or IDS using an open source tool, or is it better to buy something off the shelf? Let's step through some of the most common arguments used by each side of the open source security debate and see how they do or do not stand up in the light of practical reality."

Article Link: http://www.linuxinsider.com/story/b7hsTTW4HhJARZ/The-Truth-About-Open-Source-Security.xhtml