Difference between revisions of "Ns-3-Network-Simulator/C3/Creating-TCP/UDP-flow-with-Star-Topology/English"
From Script | Spoken-Tutorial
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* Create an on-off application to send '''UDP''' traffic | * Create an on-off application to send '''UDP''' traffic | ||
* Calculate '''throughput''' and '''delay''' | * Calculate '''throughput''' and '''delay''' | ||
| − | * Analyze the flow using a '''flow monitor | + | * Analyze the flow using a '''flow monitor'''. |
|- | |- | ||
| Line 51: | Line 51: | ||
A '''star topology''' network with '''five point to point links'''. | A '''star topology''' network with '''five point to point links'''. | ||
| − | The '''hub '''will be a part of all the links and hence, will have '''five IP addresses | + | The '''hub ''' will be a part of all the links and hence, will have '''five IP addresses'''. |
|- | |- | ||
| Line 60: | Line 60: | ||
* '''PacketSinkHelper '''class is used to create a '''packet sink '''on the '''hub'''. | * '''PacketSinkHelper '''class is used to create a '''packet sink '''on the '''hub'''. | ||
| + | |||
* '''OnOffHelper''' class is used to send a particular traffic to the hub.''' ''' | * '''OnOffHelper''' class is used to send a particular traffic to the hub.''' ''' | ||
| − | * '''PointToPointStarHelper '''class is used to create star topology using p2p links. | + | |
| + | * '''PointToPointStarHelper ''' class is used to create star topology using '''p2p''' links. | ||
|- | |- | ||
| Line 70: | Line 72: | ||
* A '''TCP flow''' from '''node 3''' to the '''hub''' | * A '''TCP flow''' from '''node 3''' to the '''hub''' | ||
| − | * A '''UDP flow''' from '''node 2 '''to the '''hub | + | * A '''UDP flow''' from '''node 2 ''' to the '''hub'''. |
Now we will go through the source file for the program. | Now we will go through the source file for the program. | ||
|- | |- | ||
|| Highlight '''Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (137));''' | || Highlight '''Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (137));''' | ||
| − | || To build '''star topology '''let us set up default values for the '''size''' of the packets. | + | || To build '''star topology ''' let us set up default values for the '''size''' of the packets. |
|- | |- | ||
|| Highlight '''Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("1400 kb/s"));''' | || Highlight '''Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("1400 kb/s"));''' | ||
| Line 81: | Line 83: | ||
|- | |- | ||
|| Only narration | || Only narration | ||
| − | || Let us build a star topology with '''p2p | + | || Let us build a star topology with '''p2p connections'''. |
For that we shall use the''' PointToPointHelper''' class. | For that we shall use the''' PointToPointHelper''' class. | ||
| Line 99: | Line 101: | ||
|- | |- | ||
|| Only narration | || Only narration | ||
| − | || Further, we create an''' on-off application''' to send '''TCP/UDP traffic''' to the '''hub'''. | + | || Further, we create an ''' on-off application''' to send '''TCP/UDP traffic''' to the '''hub'''. |
|- | |- | ||
| Line 107: | Line 109: | ||
|- | |- | ||
|| Highlight '''OnTime '''and then '''OffTime''' | || Highlight '''OnTime '''and then '''OffTime''' | ||
| − | || Now, we set the''' ontime''' to''' 1 '''and''' offtime''' to '''0'''. | + | || Now, we set the ''' ontime''' to''' 1 ''' and ''' offtime''' to '''0'''. |
Next, we fetch the '''port''' of the '''hub''' from the '''spoke node'''. | Next, we fetch the '''port''' of the '''hub''' from the '''spoke node'''. | ||
Also let us set the attribute type to '''Remote.''' | Also let us set the attribute type to '''Remote.''' | ||
| − | Then install the '''OnOffHelper '''on the '''spoke node'''. | + | Then install the '''OnOffHelper ''' on the '''spoke node'''. |
|- | |- | ||
|- | |- | ||
|| Highlight '''OnOffHelper clientHelper("ns3::UdpSocketFactory", Address());''' | || Highlight '''OnOffHelper clientHelper("ns3::UdpSocketFactory", Address());''' | ||
| − | || The address of the '''hub '''is fetched for receiving the '''UDP''' '''traffic '''from '''node 2 | + | || The address of the '''hub ''' is fetched for receiving the '''UDP''' '''traffic '''from '''node 2'''. |
|- | |- | ||
|| Only Narration | || Only Narration | ||
| − | || We then follow the same procedure as we did for '''TCP | + | || We then follow the same procedure as we did for '''TCP'''. |
| − | Now pause the tutorial and repeat the same procedure for '''UDP | + | Now pause the tutorial and repeat the same procedure for '''UDP'''. |
|- | |- | ||
|| Highlight '''Ptr<FlowMonitor> flowMonitor;''' | || Highlight '''Ptr<FlowMonitor> flowMonitor;''' | ||
| Line 136: | Line 138: | ||
|- | |- | ||
|| HIghlight '''Ptr<Ipv4FlowClassifier> classifier=DynamicCast<Ipv4FlowClassifier> (flowHelper.GetClassifier());''' | || HIghlight '''Ptr<Ipv4FlowClassifier> classifier=DynamicCast<Ipv4FlowClassifier> (flowHelper.GetClassifier());''' | ||
| − | || Let us now create an object of the '''Ipv4FlowClassifier class | + | || Let us now create an object of the '''Ipv4FlowClassifier class'''. |
| − | The created '''object '''returns a''' pointer''' to the '''flow classifier | + | The created '''object '''returns a''' pointer''' to the '''flow classifier'''. |
|- | |- | ||
| Line 151: | Line 153: | ||
|| Let’s retrieve the details of the flow using a '''for loop.''' | || Let’s retrieve the details of the flow using a '''for loop.''' | ||
| − | '''iter arrow first '''is used to collect the '''ID''' of the '''flow.''' | + | '''iter arrow first ''' is used to collect the '''ID''' of the '''flow.''' |
| − | '''iter arrow second '''is used to collect the '''data '''associated with the''' flow.''' | + | '''iter arrow second ''' is used to collect the '''data ''' associated with the''' flow.''' |
We will analyze the '''type of flow''' and '''print''' the''' delay''' and '''throughput'''. | We will analyze the '''type of flow''' and '''print''' the''' delay''' and '''throughput'''. | ||
| Line 161: | Line 163: | ||
|| The '''Destroy() '''function ends the simulation. | || The '''Destroy() '''function ends the simulation. | ||
| − | |||
|- | |- | ||
| − | || | + | || Press '''Ctrl, Alt '''and '''T keys''' |
| − | + | ||
| − | Press '''Ctrl, Alt '''and '''T keys''' | + | |
Navigate to the '''ns-allinone-3.38/ns3.38 '''directory | Navigate to the '''ns-allinone-3.38/ns3.38 '''directory | ||
| Line 172: | Line 171: | ||
|| Now we will observe the simulation. | || Now we will observe the simulation. | ||
| − | Open the terminal by pressing '''Ctrl, Alt''' and '''T keys''' simultaneously. | + | Open the terminal by pressing '''Ctrl''', '''Alt''' and '''T keys''' simultaneously. |
Using the '''cd '''command, navigate to the installation directory of '''ns-3'''. | Using the '''cd '''command, navigate to the installation directory of '''ns-3'''. | ||
| Line 183: | Line 182: | ||
Highlight '''throughput '''and '''delay''' | Highlight '''throughput '''and '''delay''' | ||
| − | || Run the command ./'''ns3 run scratch/flow2final.cc '''command. | + | || Run the command ./'''ns3 space run space scratch/flow2final.cc ''' command. |
| − | '''flow2final.cc '''is the name of the source file. | + | '''flow2final.cc ''' is the name of the source file. |
| − | After compilation, we see the details of '''TCP '''and''' UDP flows'''. | + | After compilation, we see the details of '''TCP ''' and ''' UDP flows'''. |
| − | We also see the''' throughput''' and''' delay''' of the flow. | + | We also see the ''' throughput''' and''' delay''' of the flow. |
|- | |- | ||
|- | |- | ||
| Line 200: | Line 199: | ||
* Created a '''star topology'''. | * Created a '''star topology'''. | ||
* Created a '''TCP''' flow with star topology. | * Created a '''TCP''' flow with star topology. | ||
| − | * Created a''' UDP''' flow with star topology. | + | * Created a ''' UDP''' flow with star topology. |
* Calculated '''throughput''' and '''delay''' | * Calculated '''throughput''' and '''delay''' | ||
| − | * Analyzed the''' flow''' using a '''flow monitor | + | * Analyzed the ''' flow''' using a '''flow monitor'''. |
|- | |- | ||
|| Show Slide:''' Assignment''' | || Show Slide:''' Assignment''' | ||
|| As an assignment, please do the following: | || As an assignment, please do the following: | ||
| − | * Create a''' star topology''' with 10 '''spoke''' nodes. | + | * Create a ''' star topology''' with 10 '''spoke''' nodes. |
* Create an '''on-off '''application. | * Create an '''on-off '''application. | ||
* Send '''TCP''' traffic through the '''on-off''' application. | * Send '''TCP''' traffic through the '''on-off''' application. | ||
| − | * Set the '''attribute''' to '''Remote | + | * Set the '''attribute''' to '''Remote'''. |
| − | * Analyze the flow using a flow''' monitor | + | * Analyze the flow using a flow''' monitor'''. |
|- | |- | ||
| Line 249: | Line 248: | ||
||We thank '''Dr.Moyukh Laha''' from '''IIT Kharagpur''' for his domain support. | ||We thank '''Dr.Moyukh Laha''' from '''IIT Kharagpur''' for his domain support. | ||
| − | We would also like to thank '''Dr. R. Radha, Dr. X. Anita, and Dr.T.Subbulakshmi '''from''' VIT, Chennai '''for their support. | + | We would also like to thank '''Dr. R. Radha, Dr. X. Anita, and Dr.T.Subbulakshmi '''from''' VIT, Chennai ''' for their support. |
|- | |- | ||
|| Show Slide: Thank you | || Show Slide: Thank you | ||
Latest revision as of 13:15, 26 March 2024
| Visual Cue | Narration |
| Slide:1 | Welcome to Spoken tutorial on creating TCP/UDP flow with star topology. |
| Show Slide:
Learning Objectives |
In this tutorial, we will learn to
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| Show Slide:
System Requirements |
To record this tutorial, I am using
|
| Show slide:
Pre-requisites |
To follow this tutorial
|
| Show Slide:
Code Files |
|
| Show slide:
Star topology |
For this tutorial, we would be creating the following topology.
A star topology network with five point to point links. The hub will be a part of all the links and hence, will have five IP addresses. |
| Show Slide:
Classes and Methods |
Let’s look at the classes and methods used to create TCP and UDP flows.
|
| Open code editor | I have created the source file flow2final.cc for this program.
The source code contains the required functions to create,
Now we will go through the source file for the program. |
| Highlight Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (137)); | To build star topology let us set up default values for the size of the packets. |
| Highlight Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("1400 kb/s")); | We shall also set the value for data rate to be 1400 kbps as the default value. |
| Only narration | Let us build a star topology with p2p connections.
For that we shall use the PointToPointHelper class. |
| Highlight InternetStackHelper internet;
star.InstallStack (internet); |
Then let us install the internet stack on all the nodes. |
| Highlight PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", hubLocalAddress); | Next, we shall create a packet sink to receive the packets on the hub. |
| Highlight ApplicationContainer hubApp = packetSinkHelper.Install (star.GetHub ()); | Then let us create a container to receive the packets on the hub. |
| Only narration | Further, we create an on-off application to send TCP/UDP traffic to the hub. |
| Highlight OnOffHelper onOffHelper ("ns3::TcpSocketFactory", Address ()); | The address of the hub is fetched for sending the TCP traffic to it. |
| Highlight OnTime and then OffTime | Now, we set the ontime to 1 and offtime to 0.
Next, we fetch the port of the hub from the spoke node. Also let us set the attribute type to Remote. Then install the OnOffHelper on the spoke node. |
| Highlight OnOffHelper clientHelper("ns3::UdpSocketFactory", Address()); | The address of the hub is fetched for receiving the UDP traffic from node 2. |
| Only Narration | We then follow the same procedure as we did for TCP.
Now pause the tutorial and repeat the same procedure for UDP. |
| Highlight Ptr<FlowMonitor> flowMonitor; | Then, Initialize flow monitor for tracing. |
| HIghlight FlowMonitorHelper flowHelper;
flowMonitor= flowHelper.InstallAll(); |
We shall then install a flow monitor on all the spoke nodes. |
| Highlight Simulator::Run() | Now, the Run() function is used to run the simulation. |
| HIghlight Ptr<Ipv4FlowClassifier> classifier=DynamicCast<Ipv4FlowClassifier> (flowHelper.GetClassifier()); | Let us now create an object of the Ipv4FlowClassifier class.
The created object returns a pointer to the flow classifier. |
| Highlight std::map<FlowId,FlowMonitor::FlowStats> stats=flowMonitor->GetFlowStats(); | To store the information about the network flow, let us use this command. |
| Highlight the entire for loop.
Highlight iter->first Highlight iter->second |
Let’s retrieve the details of the flow using a for loop.
iter arrow first is used to collect the ID of the flow. iter arrow second is used to collect the data associated with the flow. We will analyze the type of flow and print the delay and throughput. |
| Highlight Simulator::Destroy() | The Destroy() function ends the simulation. |
| Press Ctrl, Alt and T keys
Navigate to the ns-allinone-3.38/ns3.38 directory Type mv ~/Downloads/flow2final.cc scratch/flow2final.cc to move the source file to scratch directory. |
Now we will observe the simulation.
Open the terminal by pressing Ctrl, Alt and T keys simultaneously. Using the cd command, navigate to the installation directory of ns-3. Go to the ns-3.38 directory. Move your source file to the scratch directory within the ns-3.38 directory. |
| Type ./ns3 run scratch/flow2final.cc
Highlight throughput and delay |
Run the command ./ns3 space run space scratch/flow2final.cc command.
flow2final.cc is the name of the source file. After compilation, we see the details of TCP and UDP flows. We also see the throughput and delay of the flow. |
| Show Slide: Summary | This brings us to the end of this tutorial.
Let us summarize. In this tutorial, we have
|
| Show Slide: Assignment | As an assignment, please do the following:
|
| Show Slide:
Assignment- Observations |
In the terminal, you will observe this output with TCP flow. |
| Show Slide:
About Spoken Tutorial Project |
The video at the following link summarizes the Spoken Tutorial project.
Please download and watch it. |
| Show Slide:
Spoken Tutorial Workshops |
The Spoken Tutorial Project team conducts workshops and gives certificates.
For more details, please write to us. |
| Show Slide:
Answers for THIS Spoken Tutorial |
Please post your timed queries in this forum. |
| Show Slide:
FOSSEE Forum |
For any general or technical questions on ns-3, visit the FOSSEE forum and post your question |
| Show Slide: Acknowledgement | Spoken Tutorial Project was established by the Ministry of Education, Government of India. |
| Show Slide: Acknowledgement | We thank Dr.Moyukh Laha from IIT Kharagpur for his domain support.
We would also like to thank Dr. R. Radha, Dr. X. Anita, and Dr.T.Subbulakshmi from VIT, Chennai for their support. |
| Show Slide: Thank you | This is Arun Santhosh, a FOSSEE Summer Fellow 2023, IIT Bombay signing off.
Thank you for joining. |
