Performance Analysis of Mobile Ad Hoc Network in the Presence of Sink Hole attack

A mobile ad-hoc network (MANET) is an example of wireless mobile communication. It is a temporary network set up by the collection of multi-hop and self-configured mobile nodes without any network infrastructure or access points. Due to its unique characteristics such as dynamic topology, infrastructureless, node mobility, self-configured and self-organizing makes it different from other networks but these types of networks are more vulnerable to various security threats. One of the major security attacks is denial of service (DoS) attack. In this paper we study the effects of two types of DoS attacks namely gray hole attack and black hole attack in MANET using reactive routing protocol. Due to gray hole attack and black hole attack in the network there is an impact on the different performance metrics of the network such as throughput, packet delivery ratio and normalized routing load. All simulation is done by network simulator (NS-2).