International Conference on Advances in Computer and Electronics Technology, ISBN: 978-81-930280-1-8,16 TH November, 2014, Bangalore 24 A ROUTING ALGORITHM FOR LOCALIZATION OF LINK FAILURE IN MANET Srinivas Aluvala 1 ,Deepika Vodnala 2 ,Nagendar Yamsani 3 ,Dr. S. Phani Kumar 4 1,3 Asst. Professor, SR Engineering College 2 Research Scholor, GITAM University 4 Professor and HOD, GITAM University 1 srinu.aluvala@gmail.com, 2 deepuvodnala8@gmail.com, 3 nagendar.yamsani@gmail.com, 4 phanikumar.s@gmail.com Abstract—Routing is a critical task in Mobile Ad hoc Networks (MANET’s) due to the adaption of dynamic topology. Plenty of routing protocols were proposed and in use. Routing and route maintenance is a challenging task in MANETs due to frequent link failures which causes more data loss and delay. To overcome such problems, many of link repair mechanisms were proposed, still all of these have some limitations. This paper proposes a routing algorithm for route maintenance based on localization of link failure called DSR-LLF. It takes decision based on location of failure link of source route. Our proposed algorithm may achieve better packet preserving, increases the number of delivered packets to destination and performance of DSR. Keywords—MANET,DSR-LLF, dynamictopology, routing, preserving. I. Introduction MANET is a collection of wireless mobile nodes which comply with the other nodes in moving packets in multi-hops without any control. The nodes mobility is random, therefore MANET has dynamic topology. Due to the approach of dynamic topology, link failures in MANET’s occur frequently. These failures cause many problems such as data loss, delay in transmission etc and many other factors, which results in the degradation of capability of the network. Routing in MANET is crucial because of its dynamic topology. Many routing protocols have been proposed and in use for MANET, and these protocols categorized as proactive and reactive routing protocols. Reactive routing protocols are mostly used because of their low frequency of route discovery in comparison with pro-active routing protocols. DSR is mostly implemented in MANET. DSR protocol comes with, Route Discovery and Route Maintenance mechanisms, which work hand in hand to allow nodes in the network to discover and maintain routes to carry the data packets to the destination. However, the link failures in the network can significantly increases the overhead and decreases the performance of the network, because link failure may result in packet loss, delay and may also need global information of the nodes in the network to discover a new route, when no other route is available in route cache. Route maintenance is one of the major challenges in MANET. To mitigate the link failure problems, many local link repair mechanisms were proposed. But those mechanisms do not work on the basis of location of link failure in source route and does not make use of relay node location in source route. Our proposed routing algorithm works on link failure location in source route.