To implement network content sharing in ns3, we need to set up a scenario where nodes can share content (data packets) among each other. This can simulate a peer-to-peer network or a content distribution network (CDN). Here are the steps to implement network content sharing in ns3.
Steps for implementation
Step 1: Set up the simulation
Make sure that ns3 is installed in the computer. If not, install it.
Step 2: Create the network topology
Define the network topology with multiple nodes. In our example, let’s simulate a scenario where nodes can share content with each other.
Step 4: Define the Content Sharing Application
Simulate the content sharing mechanism by creating a custom application.
Step 4: Write the script
Here is an example script to create and configure network content sharing in ns3.
- Create a new file :
Save the below script as content-sharing.cc in the scratch directory of our ns3 installation.
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/applications-module.h”
#include “ns3/wifi-module.h”
#include “ns3/mobility-module.h”
using namespace ns3;
NS_LOG_COMPONENT_DEFINE (“ContentSharingExample”);
class ContentSharingApplication : public Application
{
public:
ContentSharingApplication ();
virtual ~ContentSharingApplication ();
void Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, Time interPacketInterval);
void SetContent (std::string content);
protected:
virtual void StartApplication (void);
virtual void StopApplication (void);
private:
void SendPacket ();
void ReceivePacket (Ptr<Socket> socket);
Ptr<Socket> m_socket;
Address m_peer;
uint32_t m_packetSize;
uint32_t m_nPackets;
Time m_interval;
uint32_t m_sent;
std::string m_content;
EventId m_sendEvent;
};
ContentSharingApplication::ContentSharingApplication ()
: m_socket (0),
m_packetSize (0),
m_nPackets (0),
m_sent (0)
{
}
ContentSharingApplication::~ContentSharingApplication ()
{
m_socket = 0;
}
void
ContentSharingApplication::Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, Time interPacketInterval)
{
m_socket = socket;
m_peer = address;
m_packetSize = packetSize;
m_nPackets = nPackets;
m_interval = interPacketInterval;
}
void
ContentSharingApplication::SetContent (std::string content)
{
m_content = content;
}
void
ContentSharingApplication::StartApplication (void)
{
m_socket->Bind ();
m_socket->Connect (m_peer);
m_socket->SetRecvCallback (MakeCallback (&ContentSharingApplication::ReceivePacket, this));
SendPacket ();
}
void
ContentSharingApplication::StopApplication (void)
{
if (m_socket)
{
m_socket->Close ();
}
Simulator::Cancel (m_sendEvent);
}
void
ContentSharingApplication::SendPacket ()
{
Ptr<Packet> packet = Create<Packet> ((uint8_t*)m_content.c_str(), m_packetSize);
m_socket->Send (packet);
if (++m_sent < m_nPackets)
{
ScheduleTx ();
}
}
void
ContentSharingApplication::ScheduleTx ()
{
m_sendEvent = Simulator::Schedule (m_interval, &ContentSharingApplication::SendPacket, this);
}
void
ContentSharingApplication::ReceivePacket (Ptr<Socket> socket)
{
Ptr<Packet> packet = socket->Recv ();
NS_LOG_UNCOND (“Received packet of size ” << packet->GetSize () << ” with content: ” << packet->GetUid ());
}
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
NodeContainer nodes;
nodes.Create (3); // Three nodes for content sharing
// Set up point-to-point links between nodes
PointToPointHelper pointToPoint;
pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“5Mbps”));
pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));
NetDeviceContainer devicesAB, devicesBC;
devicesAB = pointToPoint.Install (nodes.Get (0), nodes.Get (1)); // A to B
devicesBC = pointToPoint.Install (nodes.Get (1), nodes.Get (2)); // B to C
// Install the Internet stack on the nodes
InternetStackHelper stack;
stack.Install (nodes);
// Assign IP addresses to the devices
Ipv4AddressHelper address;
address.SetBase (“10.1.1.0”, “255.255.255.0”);
Ipv4InterfaceContainer interfacesAB = address.Assign (devicesAB);
address.SetBase (“10.1.2.0”, “255.255.255.0”);
Ipv4InterfaceContainer interfacesBC = address.Assign (devicesBC);
// Set up mobility
MobilityHelper mobility;
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (nodes);
nodes.Get (0)->GetObject<MobilityModel> ()->SetPosition (Vector (0.0, 0.0, 0.0));
nodes.Get (1)->GetObject<MobilityModel> ()->SetPosition (Vector (50.0, 0.0, 0.0));
nodes.Get (2)->GetObject<MobilityModel> ()->SetPosition (Vector (100.0, 0.0, 0.0));
// Set up content sharing applications
uint32_t packetSize = 1024;
uint32_t nPackets = 10;
Time interPacketInterval = Seconds (1.0);
// Node A sends content to Node B
Ptr<Socket> sourceSocketA = Socket::CreateSocket (nodes.Get (0), UdpSocketFactory::GetTypeId ());
Ptr<ContentSharingApplication> appA = CreateObject<ContentSharingApplication> ();
appA->Setup (sourceSocketA, InetSocketAddress (interfacesAB.GetAddress (1), 9), packetSize, nPackets, interPacketInterval);
appA->SetContent (“Content from Node A”);
nodes.Get (0)->AddApplication (appA);
appA->SetStartTime (Seconds (2.0));
appA->SetStopTime (Seconds (10.0));
// Node B sends content to Node C
Ptr<Socket> sourceSocketB = Socket::CreateSocket (nodes.Get (1), UdpSocketFactory::GetTypeId ());
Ptr<ContentSharingApplication> appB = CreateObject<ContentSharingApplication> ();
appB->Setup (sourceSocketB, InetSocketAddress (interfacesBC.GetAddress (1), 9), packetSize, nPackets, interPacketInterval);
appB->SetContent (“Content from Node B”);
nodes.Get (1)->AddApplication (appB);
appB->SetStartTime (Seconds (4.0));
appB->SetStopTime (Seconds (12.0));
// Node C receives content
Ptr<Socket> sinkSocketC = Socket::CreateSocket (nodes.Get (2), UdpSocketFactory::GetTypeId ());
InetSocketAddress localC = InetSocketAddress (Ipv4Address::GetAny (), 9);
sinkSocketC->Bind (localC);
sinkSocketC->SetRecvCallback (MakeCallback (&ContentSharingApplication::ReceivePacket, appB));
// Enable packet capturing
pointToPoint.EnablePcapAll (“content-sharing”);
// Run simulation
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
Explanation:
- Create Nodes and Network:
- Three nodes are created and connected them using point-to-point links.
- On the nodes, install the Internet stack.
- Assign IP addresses to the devices.
- Define Content Sharing Application:
- Create a ContentSharingApplication class to send and receive content.
- The SendPacket function is used to create packets with the specified content and send them.
- The ReceivePacket function is used to handle incoming packets and log their content.
- Install and Configure the Application:
- For sending and receiving, create sockets.
- On the nodes, install the ContentSharingApplication.
- Configure the application with the necessary parameters, such as packet size, number of packets, inter-packet interval, and content.
- Set up content sharing from Node A to Node B and Node B to Node C.
- Run the Simulation:
- Define the start and stop times for the applications.
- Run the simulation and log the results.
Step 4: Build and Run the Simulation
Save the script as content-sharing.cc and build the script using waf, then run the simulation.
./waf configure
./waf build
./waf –run content-sharing
Step 5: Analyze the results
We can analyze the results by observing at the logs to verify the behavior of the content sharing application after the simulation.
On the whole, we had an analysis on the implementation of network content sharing by setting up a scenario where nodes can share content (data packets) among each other. Also, we provide a detailed explanation on Network Content Sharing.
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