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Asymmetric Link: If node 1 can hear node 2, that does not imply vice versa, hence routing algorithms should be asymmetric.
Redundant connection: It consumes lot of time to update routing table , if there are many redundant connections.
Interference: Interference is very common as the data transfer is done trough waves. Natural effects like weather, scattering  can cause interference.
Dynamic topology : Since nodes can enter and leave network freely, it causes node to make frequent changes in their routing table. 

FANETs are the special form of MANETs and VANETs. They have much mobility degree and because of this topology changes more frequently than that of MANETs and VANETs. Distance between the nodes is also longer than that of the VANETs and MANETs. Hence communication range in FANETs also should be longer than that of others. Since the topology changes in an unpredictable manner, robust algorithm with dynamic routing are better to maintain communication among the nodes in the FANETs. Dynamic routing in ad hoc network is an reactive algorithm where the nodes recover the routes each time a node transfers data to other node. Since FANETs have high mobility nodes, route breakage is very common. Hence route is maintained in order to minimize the breakage. 

Network Simulator widely known as NS2, is an event driven simulation tool that has proved useful in studying dynamic nature of FANETs. NS2 enables users by providing with ways to specify network protocols and simulate their behavior. The paper has three sections. In the first section , OLSR protocol is analyzed , in the second part P-OLSR is analyzed. Third section is about the simulation results.

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