Abstract
One of the security techniques is intrusion detection system which provides a second line of defense. This system concerns with detecting malicious nodes and performing the response which could be on detected node's level or on network level. In this paper, we propose an efficient response system based on a cooperative scheme to deal with intrusions in clustered mobile ad hoc networks and work in the two levels. Our proposed system provides security against all network attacks that can be detected by any node in the network, in particular detects the actor. It is simple, reliable, and effective with no affect of channel status on the performance. The results of simulation illustrate that the scheme works well and there is a remarkable decrease in false negative and positive rates.