Introduction. A few weeks ago I read an article from securityfocus (http://www.securityfocus.c... how you can use MRTG as an Intrusion detection tool. The theory behind the article is that most attacks create some type of anomaly in the way the system is used, high amount of traffic or a high rate of errors. And with MRTG you can make this anomaly visual. And the human brain has no problem in detecting an anomaly in a visual representation. At the end of the article they give logparser...