Challenge in QoS Supporting via Integrating Differentiated Service and Multipath Routing on Mobile Ad Hoc Network

mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. A number of routing protocols like Dynamic Source Routing (DSR), Ad Hoc OnDemand Distance Vector Routing (AODV), DestinationSequenced DistanceVector (DSDV) and Temporally Ordered Routing Algorithm (TORA) have been implemented. In this paper an attempt has been made to compare the performance of two prominent ondemand reactive routing protocols for mobile ad hoc networks: DSR and AODV, along with the traditional proactive DSDV protocol.. The performance differentials are analyzed using varying network load, mobility, and network size. an on demand NodeDisjoint Multipath Routing protocol with low broadcast redundancy proposed. Multipath routing allows the establishment of multiple paths between a single source and single destination node. It is also beneficial to avoid traffic congestion and frequent link breaks in communication because of the mobility of nodes. The important components of the protocol, such as path accumulation, decreasing routing overhead and selecting nodedisjoint paths, are explained. protocol significantly reduces the total number of Route Request packets, this results in an increased delivery ratio, smaller endtoend delays for data packets, lower control overhead and fewer collisions of packets. DiffServ is a standard approach for a more scalable way to achieve QoS in any IP network and could potentially be used to provide QoS in MANETs because it minimises the need for signalling. This can classify network traffic into different priority levels and apply priority scheduling and queuing management mechanisms to obtain QoS guarantees. Keywords: MANET, Ad hoc, Routing, Multipath