Main Article Content
In MANETS (Mobile Ad Hoc Networks), prevention methods are not sufficient to make them secure. Shared medium in wireless networks makes it much more vulnerable to attacks. Intrusion detection adds to another layer of defense. Detecting intrusion by analyzing the information gathered at other layers of protocol stack as well increases the probability of detection. In this paper we present the survey of cross-layer intrusion detection schemes for MANETS. Main features for each of these schemes are described briefly, followed by a few observations. Directions for future research are presented at the end.