Mobile Ad Hoc Networks (MANET) has become an interesting technology due to the rapid development of wireless devices. The enormous growth and development accompanying the widespread use of the Internet has also raised concerns about the protection and transmission of digital data. Manets consists of endless list of mobile nodes. Dynamic topology and decentralized nodes are key features of MANETs. These features make MANETs vulnerable to several attacks. One of the important routing protocols used in ad hoc networks is the AODV (Adhoc on request Distance Vector) protocol. The security of the AODV protocol is compromised by a type of attack known as a blackhole attack. By sending a fake route in a blackhole attack malevolent nodes obstruct transfer of information. This paper analyses the performance of AODV protocol with solo blackhole attack and co-operative blackhole attack. Different scenarios are framed with varying speed of nodes. The parameters for evaluation are packet delivery ratio, throughput and end to end delay. Tool used for simulation is Network Simulator (NS2).

Ad Hoc Networks , AODV, Blackhole attack, PDR, Throughput, End to End delay