Impact of gray hole attack in VANET

Vehicular Ad Hoc Network(VANET) is a technology which accommodate the vehicle to interconnect with each other through a wireless network. So that it can track and locate other vehicles to provide road safety. Any fixed infrastructure is missing so effective route for transporting data communication is established. Security is a major issue in VANET as it can be life threatening. VANET is a subclass of ad hoc network and it is almost same as Mobile Ad Hoc Networks (MANET) but in VANET nodes are vehicles. It is a challenging topic because of frequent link disruptions caused by vehicle mobility. We have used AODV routing protocol in VANET for proper communication between nodes by forwarding data packets. We have implemented the gray hole attack on routing protocol AODV and shown its impact on implementation of VANET. We have analyzed variable parameters like a packet delivery ratio (PDR), normalized routing load (NRL), delay and throughput.