An ad-hoc network is a network of lower infrastructure, that is, there is no correction infrastructure. Each node is a mobile node and can act as a router, a source, or a base station. There is no central coordinator. AODV is a well-known on-demand routing protocol and is prone to WORMHOLE attack. The Wormhole attack is one of the most common and harmful attacks on MANET. In this work we analyze and compare the performance of AODV before and under the WORMHOLE attack in different AODV parameters. For this NS2 simulator has been used to study the performance of AODV in different number of nodes.
Wormhole Attack-Wormhole is a type of DoS attack. In this type of attack, an attacker obtains the packet from the source or neighbor node and transfers it to another malicious node (another attacker). The attack of a wormhole is a tunnel attack involving 2 or more nodes in collusion. A malicious node sends the route packet to another malicious node through a secret channel. Several types of malicious activities are carried out in this secret channel such as sniffing, dropping, selective dropping of data packets, etc.