A Survey on Gray Hole Attack in MANET

Mobile Adhoc Network (MANET) are used most commonly all around the world, because it has the ability to communicate each other without any fixed network. It has the tendency to take decisions on its own that is autonomous state. MANET is generally known for infrastructure less. The bridges in the network are generally known as a base station. A unified security solution is very much needed for networks to protect both route and data forwarding operations in the network layer. Security is an essential requirement in MANET. Without any proper security solution, the malicious node in the network will act as a normal node which causes eaves dropping and selective forwarding attack generally known as gray hole attack. In this paper we surveyed about the different types of attacks occurred in the network layer in MANET. Gray Hole attack is one of the attacks in network layer which comes under security active attacks in MANET.