Routing overhead

[rabahifa...@gmail.com]

I want to know how to calculate routing overhead on NS3 in manet-routing-compare or in any script because I did not find it on flow monitor

[Soulimane Mammar]

Hi,

You have to define what do you mean by overhead

- The time consumed by the protocol

- The bandwidth used

Flow Monitor gives you just stats based on some probes and classifiers, it's up to you to collect what you consider as overhead

Regards

[fatima zahra rabahi]

Hi Thank you for your answer 

the routing overhead I aim the set of messages used by the routing protocol excluding the data that circulates in the network 

Regards

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Rabahi Fatima Zahra

[Soulimane Mammar]

Hi,

usually routing protocols use udp transport layer with specific port number(s), for instance, OLSR uses udp port 698

So in your case, you can filter those messages and do the stat.

For example:

 

const uint8_t UDP_PROT_NUMBER = 17;

Ptr<FlowMonitor> flowMonitor;

FlowMonitorHelper flowHelper;

flowMonitor = flowHelper.InstallAll();

auto classifier = DynamicCast<Ipv4FlowClassifier>(flowHelper.GetClassifier ());

Simulator::Stop(Seconds(SimulationTime));

Simulator::Run ();

flowMonitor->CheckForLostPackets ();

stats = flowMonitor->GetFlowStats ();

auto rx_bytes{0};

for (auto stat : stats)

{

Ipv4FlowClassifier::FiveTuple t = classifier->FindFlow (stat.first);

if (t.protocol == UDP_PROT_NUMBER && (t.destinationPort == 698 || t.sourcePort == 698))

rx_bytes += stat.second.rxBytes;

}

// rx_bytes will contain the pure OLSR overhead (UDP and IP headers and MAC header/trailer not counted)

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Soulimane MAMMAR

[Soulimane Mammar]

In my last message I forgot to count txBytes

The overhead will be the sum of txBytes and rxBytes

Regards

[fatima zahra rabahi]

Thank you very much for your answer i will try it.

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Rabahi Fatima Zahra

[Ali H. Wheeb]

Dear souliman

i need your email. I have a few questions.