By Stefano Basagni; et al
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Reactive on-demand routing protocols, on the other hand, establish a route to a destination only when there is a demand for it, usually initiated by the source node through route discovery process within the network. Once a route has been established, it is maintained by the node until either the destination becomes inaccessible along every path from the source or until the route is no longer used or has expired . Representative proactive protocols include Destination-Sequenced Distance-Vector (DSDV) protocol, Clusterhead Gateway Switch Routing (CGSR) protocol, Wireless Routing Protocol (WRP), Global State Routing (GSR) , Optimized Link State Routing Protocol (OLSR), Fisheye State Routing (FSR)  Protocol, Landmark Routing (LANMAR) Protocol, and Hierarchical State Routing (HSR).
Proactive routing protocols generally provide better quality of service than on-demand protocols. As in proactive protocols, routing information is constantly updated, routes to every destination are always available and up-to-date, and, hence, end-to-end delay can be minimized. For on-demand protocols, the source node has to wait for the route to be discovered before communication can happen. This latency in route discovery might be intolerable for real-time communications. In , the authors present a set of tables that summarize the main differences between these protocols in terms of their complexity, route update patterns, and capabilities.
To prevent attackers from injecting erroneous routing information and data traffic, use of digital signatures to authenticate a message has been proposed [120, 122]. Implementation of these schemes requires a certification authority function to manage the private–public keys and to distribute keys via certificates. Since certification authority function is not possible in MANET, this function needs to be distributed over multiple nodes. Reference  defines the specific message formats to be used to carry the digital signature.