A Survey on Detection of Blackhole Attack using AODV Protocol in MANET

A mobile ad-hoc network(MANET) is a self-configuring infrastructureless network of mobile devices. Each must forward traffic unrelated to its own use, and therefore be a router. The primary challenge in building a MANET is equipping each device to continuously maintain the information required to properly route traffic. A ODV (Ad-hoc On-demand Distance Vector) is a loop-free routing protocol for ad-hoc networks. It is designed to be self- starting in an environment of mobile nodes, withstanding a variety of network behaviours such as node mobility, link failures etc. Blackhole attackis a type of denial- of- service attack in which a router that is supposed to relay packets instead discards them. This usually occurs from a router becoming compromised from a number of different causes. One cause mentioned in research is through a denial -of -service attack on the router.Because packets are routinely dropped from a lossy network, the packet drop attack is very hard to detect and prevent. In this paper, an attempt is made to understand the possible solutions to Blackhole attack with various methodologies proposed earlier