Collusion attack resistance through forced MPR switching in OLSR

Collusion Attack is an attack against Mobile Ad Hoc Networks and is based on Optimised Link State Routing (OLSR) Protocol. In this attack, two attacking nodes collude to prevent routes to a target node from being established in the network. Packet Delivery Ratio (PDR) of nodes 2-hops away from the victim drops to 0%. Multi Point Relay (MPR) selection process in OLSR is exploited to achieve route denial. In this paper, we propose a novel attack resistant method named Forced MPR Switching OLSR (FMS-OLSR), in which, whenever a node observes symptoms of the attack, it temporarily blacklists potential attackers. This forces recomputation of its MPR set, thus, avoiding the attack. Simulation results on ns-3 show that FMS-OLSR is resistant to Collusion Attacks and incurs only a minimal penalty on network performance.