To implement En Route Filtering in ns3, we need to follow several steps for setting up a simulation that includes the necessary filtering mechanisms. En Route Filtering is often used in wireless sensor networks (WSNs) to detect and filter out malicious data as it traverses the network. Here is a complete guide to achieve this.
Steps for implementation
Step 1: Set up the simulation
Make sure that ns3 is installed in the computer. If not, install it from the official ns3 website.
Step 2: Create a New Simulation Script
In the scratch directory of our ns3, we should create a simulation script. In our example, let’s create a file named en_route_filtering.cc.
Step 3: Include Necessary Headers
Include all the necessary ns3 headers in our script.
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/wifi-module.h”
#include “ns3/mobility-module.h”
#include “ns3/applications-module.h”
#include “ns3/packet-sink-helper.h”
#include “ns3/flow-monitor-helper.h”
using namespace ns3;
Step 4: Define En Route Filtering Logic
Use the en route filtering logic as part of a new application or within existing network layers. Here, we will set up a basic packet filtering function that checks for a specific condition.
class EnRouteFilter : public Application
{
public:
EnRouteFilter();
virtual ~EnRouteFilter();
void Setup(Ptr<Node> node);
void FilterPacket(Ptr<Packet> packet);
private:
virtual void StartApplication() override;
virtual void StopApplication() override;
Ptr<Node> m_node;
bool FilterCondition(Ptr<Packet> packet);
};
EnRouteFilter::EnRouteFilter() {}
EnRouteFilter::~EnRouteFilter() {}
void EnRouteFilter::Setup(Ptr<Node> node)
{
m_node = node;
}
void EnRouteFilter::StartApplication() {}
void EnRouteFilter::StopApplication() {}
bool EnRouteFilter::FilterCondition(Ptr<Packet> packet)
{
// Implement your filtering condition here
// For example, filter packets with a certain size
return packet->GetSize() < 50;
}
void EnRouteFilter::FilterPacket(Ptr<Packet> packet)
{
if (FilterCondition(packet))
{
NS_LOG_INFO(“Packet filtered out.”);
}
else
{
NS_LOG_INFO(“Packet allowed.”);
// Forward packet to the next node or application
}
}
Step 5: Integrate Filtering Application in Your Simulation
Instantiate the EnRouteFilter application in your main simulation script and attach it to the nodes in your network.
int main(int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse(argc, argv);
NodeContainer nodes;
nodes.Create(3);
WifiHelper wifi;
wifi.SetStandard(WIFI_STANDARD_80211g);
WifiMacHelper wifiMac;
wifiMac.SetType(“ns3::AdhocWifiMac”);
YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default();
YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default();
wifiPhy.SetChannel(wifiChannel.Create());
NetDeviceContainer devices = wifi.Install(wifiPhy, wifiMac, nodes);
MobilityHelper mobility;
mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);
mobility.Install(nodes);
InternetStackHelper stack;
stack.Install(nodes);
Ipv4AddressHelper address;
address.SetBase(“10.1.1.0”, “255.255.255.0”);
Ipv4InterfaceContainer interfaces = address.Assign(devices);
// Create and setup EnRouteFilter application
Ptr<EnRouteFilter> enRouteFilter = CreateObject<EnRouteFilter>();
enRouteFilter->Setup(nodes.Get(1));
nodes.Get(1)->AddApplication(enRouteFilter);
enRouteFilter->SetStartTime(Seconds(1.0));
enRouteFilter->SetStopTime(Seconds(10.0));
Simulator::Stop(Seconds(10.0));
Simulator::Run();
Simulator::Destroy();
return 0;
}
Step 6: Compile and Run Your Simulation
Compile your simulation script using waf:
./waf configure
./waf build
./waf –run scratch/en_route_filtering
Step 7: Analyze the Output
To ensure that packets are being filtered according to the conditions defined in your EnRouteFilter application, analyze the log output.
Additional Enhancements
- Complex Conditions: Include more complex filtering criteria, such as checking packet payload or header fields by extending the FilterCondition function.
- Statistics: Collect and compare statistics on the number of packets filtered versus allowed.
- Visualization: Visualize the network topology and the flow of packets by using ns3 visualization tools.
Overall, we had an analysis on the implementation of en route filtering using ns3 by simulating scenarios where different networks share the same frequency spectrum. Also, we provide more related information on En Route Filtering.
In every aspect of your project, we deliver implementation results for En Route Filtering through ns3simulation, thanks to our effective filtering mechanisms that ensure optimal outcomes. For the best results, reach out to ns3simulation.com. We handle all ns3tool projects and focus on enhancing project performance.