The important characteristics of a Mobile Adhoc Networks are the mobility of the hosts, Dynamic topology and
its infrastructure less wireless connectivity. These Adhoc networks are accessible to legitimate users and also to the
malicious attackers. The routes in an Adhoc network are mainly multi-hop because of the limited radio transmission range.
Due to the nature of this openness, any malicious node gaining access to the network may attempt a black or gray hole
attack in the network. Detection of such attacks are challenging due to the Adhoc nature of the network.
In this paper we present a progression based method for the detection of such attacks in such networks. The
design makes use of the function of network layer to eavesdrop the next hop’s action and the MAC layer to guess the
collision detection threshold. In this work, efforts has been made to curtail the additional control packets to avoid the over
usage of system resources. The technique has been tested in DSR protocol.