## Working with first.cc

Step 1 - Copy first.cc file from tutorial to scratch forlder.

note- never edit tutorials files.

#include "ns3/applications-module.h"
#include "ns3/core-module.h"
#include "ns3/internet-module.h"
#include "ns3/network-module.h"
#include "ns3/point-to-point-module.h"

// Default Network Topology
//
// 10.1.1.0
// n0 -------------- n1
// point-to-point
//

using namespace ns3;

NS_LOG_COMPONENT_DEFINE("FirstScriptExample");

int
main(int argc, char* argv[])
{
CommandLine cmd(__FILE__);
cmd.Parse(argc, argv);

Time::SetResolution(Time::NS);
LogComponentEnable("UdpEchoClientApplication", LOG_LEVEL_INFO);
LogComponentEnable("UdpEchoServerApplication", LOG_LEVEL_INFO);

NodeContainer nodes;
nodes.Create(2);

PointToPointHelper pointToPoint;
pointToPoint.SetDeviceAttribute("DataRate", StringValue("5Mbps"));
pointToPoint.SetChannelAttribute("Delay", StringValue("2ms"));

NetDeviceContainer devices;
devices = pointToPoint.Install(nodes);

InternetStackHelper stack;
stack.Install(nodes);

Ipv4AddressHelper address;
address.SetBase("10.1.1.0", "255.255.255.0");

Ipv4InterfaceContainer interfaces = address.Assign(devices);

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(nodes.Get(1));
serverApps.Start(Seconds(1.0));
serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(interfaces.GetAddress(1), 9);
echoClient.SetAttribute("MaxPackets", UintegerValue(1));
echoClient.SetAttribute("Interval", TimeValue(Seconds(1.0)));
echoClient.SetAttribute("PacketSize", UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(nodes.Get(0));
clientApps.Start(Seconds(2.0));
clientApps.Stop(Seconds(10.0));

Simulator::Run();
Simulator::Destroy();
return 0;
}


### Changing port from 9 to 3689
![Uploading file..._4ws5xyauo]()


### Code for network Animation-

Add this code to first.cc

#include "ns3/netanim-module.h"
 AnimationInterface anim("first.xml");
    anim.SetConstantPosition(nodes.Get(0),10.0,10.0);
    anim.SetConstantPosition(nodes.Get(1),20.0,20.0); 

$ ./ns3 run scratch/first

This will generate first.xml file.

Execute first.xml by NetAnim tool.
$ ./NetAnim



Ascii Formate tracing

AsciiTraceHelper ascii;
pointToPoint.EnableAsciiAll(ascii.CreateFileStream("First.tr"));


### TraceMetrics

1- Download tracemetrics- https://sourceforge.net/projects/tracemetrics/
2- Extract

$ cd tracemetrics
$ java -jar tracemetrics.jar

Choose the file to run.