## Working wih second.cc

#include "ns3/applications-module.h"
#include "ns3/core-module.h"
#include "ns3/csma-module.h"
#include "ns3/internet-module.h"
#include "ns3/ipv4-global-routing-helper.h"
#include "ns3/network-module.h"
#include "ns3/point-to-point-module.h"

// Default Network Topology
//
// 172.16.1.0
// n0 -------------- n1 n2 n3 n4
// point-to-point | | | |
// ================
// LAN 172.16.2.0

using namespace ns3;

NS_LOG_COMPONENT_DEFINE("SecondScriptExample");

int
main(int argc, char* argv[])
{
bool verbose = true;
uint32_t nCsma = 3;

CommandLine cmd(__FILE__);
cmd.AddValue("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma);
cmd.AddValue("verbose", "Tell echo applications to log if true", verbose);

cmd.Parse(argc, argv);

if (verbose)
{
LogComponentEnable("UdpEchoClientApplication", LOG_LEVEL_INFO);
LogComponentEnable("UdpEchoServerApplication", LOG_LEVEL_INFO);
}

nCsma = nCsma == 0 ? 1 : nCsma;

NodeContainer p2pNodes;
p2pNodes.Create(2);

NodeContainer csmaNodes;
csmaNodes.Add(p2pNodes.Get(1));
csmaNodes.Create(nCsma);

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

NetDeviceContainer p2pDevices;
p2pDevices = pointToPoint.Install(p2pNodes);

CsmaHelper csma;
csma.SetChannelAttribute("DataRate", StringValue("100Mbps"));
csma.SetChannelAttribute("Delay", TimeValue(NanoSeconds(6560)));

NetDeviceContainer csmaDevices;
csmaDevices = csma.Install(csmaNodes);

InternetStackHelper stack;
stack.Install(p2pNodes.Get(0));
stack.Install(csmaNodes);

Ipv4AddressHelper address;
address.SetBase("172.16.1.0", "255.255.255.0");
Ipv4InterfaceContainer p2pInterfaces;
p2pInterfaces = address.Assign(p2pDevices);

address.SetBase("172.16.2.0", "255.255.255.0");
Ipv4InterfaceContainer csmaInterfaces;
csmaInterfaces = address.Assign(csmaDevices);

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(csmaNodes.Get(nCsma));
serverApps.Start(Seconds(1.0));
serverApps.Stop(Seconds(10.0));

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

ApplicationContainer clientApps = echoClient.Install(p2pNodes.Get(0));
clientApps.Start(Seconds(2.0));
clientApps.Stop(Seconds(10.0));

Ipv4GlobalRoutingHelper::PopulateRoutingTables();

pointToPoint.EnablePcapAll("second");
csma.EnablePcap("second", csmaDevices.Get(1), true);

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

$ ./ns3 run scratch/second


To send 2/3 packets use
`echoClient.SetAttribute("MaxPackets", UintegerValue(2/3));`


PCAP file generated after p2p and CSMA node packet tranfer.

### To generate pcap file code is below.

    pointToPoint.EnablePcapAll("p2p");
    csma.EnablePcap("csma1", csmaDevices.Get(1), true);
    csma.EnablePcap("csma3", csmaDevices.Get(3), true);


$ wireshark p2p-1-0.pcap


$ wireshark csma1-2-0.pcap

### Network Animation Code

#include "ns3/netanim-module.h"
 AnimationInterface anim("second.xml");
    anim.SetConstantPosition(p2pNodes.Get(0),10.0,10.0);
    anim.SetConstantPosition(csmaNodes.Get(0),20.0,20.0);
    anim.SetConstantPosition(csmaNodes.Get(0),30.0,30.0);
    anim.SetConstantPosition(csmaNodes.Get(0),40.0,40.0);
    anim.SetConstantPosition(csmaNodes.Get(0),50.0,50.0);

$ ./NetAnim

Select second.xml.


### Ascii Trace-

AsciiTraceHelper ascii;
    pointToPoint.EnableAsciiAll(ascii.CreateFileStream("point2point.tr"));
    csma.EnableAsciiAll(ascii.CreateFileStream("csma2.tr"));

$ java -jar tracemetrics.jar