Avoiding Wormhole Attack in MANET Using an Extending Network Knowledge

The Optimized Link State Routing Protocol is developed for Mobile Ad Hoc Networks. It operates as a table driven, proactive protocol. The core of the OLSR is the selection of Multipoint Relays (MPRs), used as a component of a flooding mechanism. MPRs distribute control traffic messages within the network while reducing the redundancy in the flooding process. An OLSR node selects its MPR set in a manner that all two hop neighbors are reachable by the minimum number of MPRs. However, if an MPR misbehaves during the control phase, the network connectivity is then compromised. This paper introduces a new Multipoint Relays (MPR) selection algorithm with additional coverage. It also specifies an extension of the OLSR protocol in order to provide multiple disjoint paths especially for dynamic topologies. Disjoint paths are helpful for increasing network throughput, improving forwarding reliability, load balancing and security.