Here we share with you how to implement a custom address protocol in ns3, address assignment and resolution functionalities should be handled properly, for that we have to create a new module. Contact us to work on your module if you want more help.
Below given steps will guide you to implement a basic address protocol in ns3.
Step-by-Step Guide to Implementing an Address Protocol in ns-3
- Set Up Your Environment
Ensure that ns3 is installed on the system.
- Create a New ns-3 Module
Create a new module for the address protocol in the src directory on the ns3 installation. This involves creating the necessary directory structure and files.
cd ns3.xx
cd src
mkdir -p address-protocol/model
mkdir -p address-protocol/helper
mkdir -p address-protocol/test
3. Create the Address Protocol Header File
Create the address protocol header file address-protocol.h in the model directory.
#ifndef ADDRESS_PROTOCOL_H
#define ADDRESS_PROTOCOL_H
#include “ns3/ipv4-address.h”
#include “ns3/net-device.h”
#include “ns3/node.h”
#include “ns3/object.h”
#include “ns3/simple-ref-count.h”
#include “ns3/packet.h”
#include “ns3/socket.h”
#include <map>
namespace ns3 {
class AddressProtocol : public Object
{
public:
static TypeId GetTypeId (void);
AddressProtocol ();
virtual ~AddressProtocol ();
void AssignAddress (Ptr<Node> node, Ipv4Address address);
Ipv4Address ResolveAddress (Ptr<Node> node);
private:
std::map<Ptr<Node>, Ipv4Address> m_addressMap;
};
} // namespace ns3
#endif /* ADDRESS_PROTOCOL_H */
4. Create the Address Protocol Source File
Create the address protocol source file address-protocol.cc in the model directory.
#include “address-protocol.h”
#include “ns3/log.h”
namespace ns3 {
NS_LOG_COMPONENT_DEFINE (“AddressProtocol”);
NS_OBJECT_ENSURE_REGISTERED (AddressProtocol);
TypeId
AddressProtocol::GetTypeId (void)
{
static TypeId tid = TypeId (“ns3::AddressProtocol”)
.SetParent<Object> ()
.SetGroupName(“Internet”)
.AddConstructor<AddressProtocol> ();
return tid;
}
AddressProtocol::AddressProtocol ()
{
}
AddressProtocol::~AddressProtocol ()
{
}
void
AddressProtocol::AssignAddress (Ptr<Node> node, Ipv4Address address)
{
m_addressMap[node] = address;
NS_LOG_INFO (“Assigned address ” << address << ” to node ” << node->GetId ());
}
Ipv4Address
AddressProtocol::ResolveAddress (Ptr<Node> node)
{
if (m_addressMap.find(node) != m_addressMap.end())
{
return m_addressMap[node];
}
return Ipv4Address::GetZero ();
}
} // namespace ns3
5. Define Address Protocol Helper
Create the address protocol helper header file address-protocol-helper.h in the helper directory.
#ifndef ADDRESS_PROTOCOL_HELPER_H
#define ADDRESS_PROTOCOL_HELPER_H
#include “ns3/node-container.h”
#include “ns3/address-protocol.h”
namespace ns3 {
class AddressProtocolHelper
{
public:
AddressProtocolHelper ();
virtual ~AddressProtocolHelper ();
void Install (NodeContainer nodes);
private:
Ptr<AddressProtocol> m_protocol;
};
} // namespace ns3
#endif /* ADDRESS_PROTOCOL_HELPER_H */
Create the address protocol helper source file address-protocol-helper.cc in the helper directory.
#include “address-protocol-helper.h”
#include “ns3/node.h”
#include “ns3/log.h”
namespace ns3 {
NS_LOG_COMPONENT_DEFINE (“AddressProtocolHelper”);
AddressProtocolHelper::AddressProtocolHelper ()
{
m_protocol = CreateObject<AddressProtocol> ();
}
AddressProtocolHelper::~AddressProtocolHelper ()
{
}
void
AddressProtocolHelper::Install (NodeContainer nodes)
{
for (NodeContainer::Iterator i = nodes.Begin (); i != nodes.End (); ++i)
{
Ptr<Node> node = *i;
node->AggregateObject (m_protocol);
}
}
} // namespace ns3
6. Update CMakeLists.txt
Add the new address protocol module to the ns3 build system. Edit src/CMakeLists.txt and add the following line:
add_subdirectory (address-protocol)
Create src/address-protocol/CMakeLists.txt with the following content:
ns3_add_library (address-protocol
model/address-protocol.cc
helper/address-protocol-helper.cc
)
target_link_libraries (address-protocol)
7. Set Up the Network Topology
Create a simulation script in the scratch directory to use the address protocol.
#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/address-protocol-helper.h”
using namespace ns3;
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
NodeContainer nodes;
nodes.Create (2);
// Set up WiFi
WifiHelper wifi;
wifi.SetStandard (WIFI_PHY_STANDARD_80211b);
YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();
wifiPhy.SetChannel (wifiChannel.Create ());
WifiMacHelper wifiMac;
wifiMac.SetType (“ns3::AdhocWifiMac”);
NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, nodes);
// Set up mobility model
MobilityHelper mobility;
mobility.SetPositionAllocator (“ns3::GridPositionAllocator”,
“MinX”, DoubleValue (0.0),
“MinY”, DoubleValue (0.0),
“DeltaX”, DoubleValue (5.0),
“DeltaY”, DoubleValue (10.0),
“GridWidth”, UintegerValue (2),
“LayoutType”, StringValue (“RowFirst”));
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (nodes);
// Install the internet stack on nodes
InternetStackHelper stack;
stack.Install (nodes);
// Install address protocol
AddressProtocolHelper addressProtocol;
addressProtocol.Install (nodes);
// Assign addresses to nodes
Ptr<Node> node1 = nodes.Get (0);
Ptr<Node> node2 = nodes.Get (1);
Ptr<AddressProtocol> protocol1 = node1->GetObject<AddressProtocol> ();
Ptr<AddressProtocol> protocol2 = node2->GetObject<AddressProtocol> ();
protocol1->AssignAddress (node1, Ipv4Address (“10.1.1.1”));
protocol2->AssignAddress (node2, Ipv4Address (“10.1.1.2”));
// Verify address assignment
NS_LOG_UNCOND (“Node 0 address: ” << protocol1->ResolveAddress (node1));
NS_LOG_UNCOND (“Node 1 address: ” << protocol2->ResolveAddress (node2));
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
8. Build and Run the Simulation
After writing the script, we need to build and run it.
./waf build
./waf –run scratch/address-simulation
9. Analyze the Results
After running the simulation, we can analyze the results using the logs.
Complete Example Script for Address Protocol
Here’s a complete example script for reference:
#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/address-protocol-helper.h”
using namespace ns3;
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
NodeContainer nodes;
nodes.Create (2);
// Set up WiFi
WifiHelper wifi;
wifi.SetStandard (WIFI_PHY_STANDARD_80211b);
YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();
wifiPhy.SetChannel (wifiChannel.Create ());
WifiMacHelper wifiMac;
wifiMac.SetType (“ns3::AdhocWifiMac”);
NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, nodes);
// Set up mobility model
MobilityHelper mobility;
mobility.SetPositionAllocator (“ns3::GridPositionAllocator”,
“MinX”, DoubleValue (0.0),
“MinY”, DoubleValue (0.0),
“DeltaX”, DoubleValue (5.0),
“DeltaY”, DoubleValue (10.0),
“GridWidth”, UintegerValue (2),
“LayoutType”, StringValue (“RowFirst”));
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (nodes);
// Install the internet stack on nodes
InternetStackHelper stack;
stack.Install (nodes);
// Install address protocol
AddressProtocolHelper addressProtocol;
addressProtocol.Install (nodes);
// Assign addresses to nodes
Ptr<Node> node1 = nodes.Get (0);
Ptr<Node> node2 = nodes.Get (1);
Ptr<AddressProtocol> protocol1 = node1->GetObject<AddressProtocol> ();
Ptr<AddressProtocol> protocol2 = node2->GetObject<AddressProtocol> ();
protocol1->AssignAddress (node1, Ipv4Address (“10.1.1.1”));
protocol2->AssignAddress (node2, Ipv4Address (“10.1.1.2”));
// Verify address assignment
NS_LOG_UNCOND (“Node 0 address: ” << protocol1->ResolveAddress (node1));
NS_LOG_UNCOND (“Node 1 address: ” << protocol2->ResolveAddress (node2));
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
From this, implementation process we come to know that custom address protocol can be implemented by creating a new module to handle the address assignment and resolution functionalities in the ns3 simulation. Get in touch with ns3simulation.com for more help if you want implementation clarification.