Building Topology in NS3
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This document discusses building a point-to-point topology simulation in NS-3. It describes: 1) Creating nodes using the Node class and NodeContainer helper. 2) Attaching NetDevices and channels using helpers like PointToPointHelper. 3) Installing the internet protocol stack on nodes with InternetStackHelper. 4) Assigning IP addresses to nodes with Ipv4AddressHelper. 5) Running applications like UdpEchoServer and UdpEchoClient on nodes using helpers. 6) Starting the simulation and destroying it after completion.
![Building Topology
[Part-01]](https://image.slidesharecdn.com/3session-buildingtopology-150112224704-conversion-gate01/85/Building-Topology-in-NS3-1-320.jpg)
![Flow Chart
Create Node
Attach NetDeive
&
Channel
[NODES]
Install
Protocol Stack
[NODES]
Assign
Ip Address
[NETDEVICE]
Install
Application
[NODES]](https://image.slidesharecdn.com/3session-buildingtopology-150112224704-conversion-gate01/85/Building-Topology-in-NS3-3-320.jpg)
Building Topology in NS3
- 2. Point-To -Point Topology <Reading Code> Node-1 Node-2
- 3. Flow Chart Create Node Attach NetDeive & Channel [NODES] Install Protocol Stack [NODES] Assign Ip Address [NETDEVICE] Install Application [NODES]
- 4. Node ● Use to create NODE – To create NODE Object we use Node class with TEMPLATE function CreateObject<> & Reference Counting Smart Pointer Ptr<> Ptr<Node> n= CreateObject<Node>(); ● Use of Helper Class – To create Group of NODE we use NodeContainer NodeContainer nc; nc.Create(3);
- 5. Channel & NetDevice ● It is a logical path over which information flows – To create Channel we use following classes:- ● WifiChannel ● CsmaChannel ● PointToPointChannel ● Etc... – To create NetDevice we use following classes:- ● WifiNetDevice ● CsmaNetDevice ● PointToPointNetDevice ● Etc...
- 6. Channel & NetDevice ● Use of Helper Classes – We can use Helper Classes:- ● WifiHelper ● CsmaHelper ● PointToPointHelper ● Now ATTACH NetDevice & Channel – NetDeviceContainer device – device=pointTopoint.Install(NodeContainer); ● At this point we are done with :- – NODE – NetDevice – Channel Coupling of NetDevice with Channel NetDevice-0 NetDevice-1Point-to-point Channel Node-0 Node-1
- 7. Internet Stack & Ipv4Address ● Now its time to install Protocol Stack – Helper Class ● InternetStackHelper i ● Now INSTALL protocol stack on Nodes – i.install(NodeContainer); ● Ipv4Address – Now associate the devices on our node with IP addresses ● Ipv4AddressHelper iaddr; ● Iaddr.SetBase(“10.1.1.0”,”255.255.255.0”); – Now assign this IP address to Nodes using Ipv4Interface object ● Ipv4InterfaceContainer iinter = iaddr.Assign(device) NetDevice-0 NetDevice-1Point-to-point Channel Node-0 Node-1 Internet Stack Internet Stack10.1.1.1/24 10.1.1.2/24
- 8. Application ● Application abstract class – UdpEchoServerApplication – server application – UdpEchoClientApplication -client application ● We use Helper classes – UdpEchoServerHelper – UdpEchoClientHelper
- 9. Server Application UdpEchoServerHelper server(9); – Set up a UDP echo server application on one of the node – Require the port number as a parameter to the constructor ApplicationContainer serApp; serApp.Install(nodes.Get(1)); servApp.Start(Seconds(1.0)); servApp.Stop(Seconds(10.0)); – Install server application on Node-1 NetDevice-0 NetDevice-1Point-to-point Channel Node-0 Node-1 Internet Stack Internet Stack10.1.1.1/24 10.1.1.2/24 Server App NetDevice-0 NetDevice-1Point-to-point Channel Node-0 Node-1 Internet Stack Internet Stack10.1.1.1/24 Server App
- 10. Client Application UdpEchoClientHelper client(i.GetAddress(1),9); ● Pass parameter (to helper) to set the Remote Address and Remote port for for client to connect. ApplicationContainer clientApp =client.Install(nodes.Get(0)); clientApp.Start(Seconds(2.0)); clientApp.Stop(Seconds(9.0)); NetDevice-0 NetDevice-1Point-to-point Channel Node-0 Node-1 Internet Stack Internet Stack10.1.1.1/24 Server AppClient App 10.1.1.2/24
- 11. Start Simulation Simulation::Run(); Simulation::Destroy(); return 0; NetDevice-0 NetDevice-1Point-to-point Channel Node-0 Node-1 Internet Stack Internet Stack Server AppClient App
- 12. Running Example ● Copy program from example to scratch folder ● And run using following commands ● ./waf --run /scratch/first
- 13. Simple Modification in Topology CODE ● Change following values:- ● NetDevice – DataRate – Delay ● UDP packet – MaxPacket – Interval – Packet Size
- 14. ● What is the use of Helper Classes ? ● Why we use Container class ? ● Effect of Packet Size on Rx time @Server ?