Blackhole attack detection and prevention by real time monitoring

Adhoc network is a temporary network formed to share data among nodes. Network is constrained about resources and always has threat from malicious nodes. Blackhole attack is one of the attacks in which, attacker node intentionally drops all packets which it had to forward to its neighbor nodes. In this paper, we propose a method to detect and prevent Blackhole attack by real time monitoring suspected node by its neighbor node. AODV routing protocol is modified to simulate the detection and prevention method. Node which replies to RouteRequest (RREQ) by source is monitored in promiscuous mode. Neighbor node of RouteReply (RREP) sender node is actually detecting malicious node.