Abstract: “Mobile Ad-hoc network (MANET) is infrastructure less network in which nodes are mobile, self reconfigurable, limited battery powered. The key challenge of ad hoc networks is the design of dynamic routing protocols that can efficiently establish a route between pair of nodes. As nodes in MANET are limited battery powered, they may get totally discharged during active communication, causing packet drops resulting in low packet delivery ratio. The aim of this paper is to reduce the packet drops due to node failures thereby increasing packet delivery ratio. Our modified protocol named Improved Zone Routing Protocol (IZRP) makes use of energy factor, which is a function of residual energy of the node and it selects the nodes with good battery lifetime to establish a path between source and destination. The goal of this work is to find a solution to address the link failure challenges in improving the reliability of packet-delivery services in MANETs. To analyze relative performance of modif”

Keywords: MANET, protocols, ZRP, routing zone.