Abstract: “A wireless Adhoc network is a collection of mobile nodes with no pre-established infrastructure, forming a temporary network. In the absence of a fixed infrastructure, nodes have to cooperate in order to provide the necessary network functionality. One of the principal routing protocols used in Ad hoc networks is AODV (Ad hoc On-Demand Distance Vector) protocol. The security of the AODV protocol is compromised by a particular type of attack called ‘Black Hole’ attack [1]. In this attack a malicious node advertises itself as having the shortest path to the node whose packets it wants to intercept. It is proposed to wait and check the replies from all the neighboring nodes to find the Black hole nodes. In this paper, we detect the Black hole nodes or malicious nodes and after detecting it we will remove those nodes and also find the shortest path from source to destination by using GLOMOSIM. We propose that our protocol is increase the throughput, security and life time of the network by”

Keywords: MANETS, black hole attack, malicious