Survey on Blackhole and Denial of Service Attack over MANET Environment
Security is a major challenge in Mobile Ad hoc Network (MANET) due to their features of dynamically changing topologies, frequent host movement, Multi hop wireless links and lack of clear line of defense. Protecting the network layer of a MANET from malicious attacks is an important and challenging issue. This paper analyzes the black hole and denial of service attack which is very severe type of possible attacks in Mobile Ad hoc Networks (MANETs) In a black hole attack, malicious nodes advertise itself by sending a false route reply packet to a source node that initiates a route discovery process and drops all packets whereas DDOS attacks target the resources of these services, lowering their ability to provide optimum usage of the network infrastructure. In this paper, we are investigating the effect of black hole and dos attack on MANET environment and recommend practical defense mechanisms against blackhole and DOS attacks. The implementation of the proposed concept is provided using the Ad hoc on Demand Distance Vector routing protocol modification in network simulator 2 i.e. NS 2.