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AODV routing Protocol simulation using NS2

The Network Simulator (NS-2) is a most widely used network simulator. It has the capabilities to simulate a range of networks including wired and wireless networks. In this tutorial, we present the implementation of Ad Hoc On-Demand Distance Vector (AODV) Protocol in NS-2.This tutorial is targeted to the novice user who wants to understand the implementation of AODV Protocol in NS-2

FILE REFERENCE OF AODV.H 

The step by step process happening in AODV network simulation in NS2

1. In the TCL script, when the user configures AODV as a routing protocol by using the command,

$ns node-config -adhocRouting AODV

the pointer moves to the “start” and this “start” moves the pointer to the Command function of AODV protocol.

2. In the Command function, the user can find two timers in the “start”

* btimer.handle((Event*) 0);

* htimer.handle((Event*) 0);

3. Let’s consider the case of htimer, the flow points to HelloTimer::handle(Event*) function and the user can see the following lines:

agent -> sendHello();

double interval = MinHelloInterval + ((MaxHelloInterval - Min-HelloInterval) * Random::uniform());

assert(interval -> = 0);

Scheduler::instance().schedule(this, &intr, interval);

These lines are calling the sendHello() function by setting the appropriate interval of Hello Packets.

4. Now, the pointer is in AODV::sendHello() function and the user can see Scheduler::instance().schedule(target , p, 0.0) which will schedule the packets.

5. In the destination node AODV::recv(Packet*p, Handler*) is called, but actually this is done after the node is receiving a packet.

6. AODV::recv(Packet*p, Handler*) function then calls the recvAODV(p) function.

7. Hence, the flow goes to the AODV::recvAODV(Packet *p) function, which will check different packets types and call the respective function.

8. In this example, flow can go to case 

AODVTYPE HELLO:

recvHello(p);

break;

9. Finally, in the recvHello() function, the packet is received.

hope you have got it how to do ...
you can also generate the codes using NSG2

The files related are given below

aodv.cc

aodv.h

simple-wireless.tcl

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