Routing mechanism using DSDV protocol to prevent blackhole attack in MANET

Mobile ad hoc network (MANET) is a collection of mobile nodes that communicate with each other without any fixed infrastructure or a central network authority. From a security design perspective, MANETs have no clear line of defense; i.e. no built-in security. Thus, the wireless channel is accessible to both legitimate network users and malicious attackers. A black hole attack is a severe attack that can be easily employed against data routing in MANETs. A black hole is a malicious node that can falsely reply for any route requests without having an active route to a specified destination and drops all the receiving data packets. In this paper we investigated the effects of Black Hole attacks on the network performance. We simulated black hole attacks in Network Simulator 2 (ns-2) and to detect the Black hole attacks in the network. In this novel scheme for Detecting Black hole Attacks in MANETs is introduced. The DBA-DSDV protocol detects and avoids the black hole problem before the actual routing mechanism is started to catch the malicious nodes. Simulation results are provided, when black hole nodes are present in the network.