How to Calculate Network DHCP Management in omnet++

To calculate the network DHCP (Dynamic Host Configuration Protocol) management in OMNeT++ encompasses mimicking the procedures used to dynamically assign IP addresses and other network configuration parameters to devices on the network. Successful DHCP management make sure that devices can faultlessly add the network with the right configuration, decreasing conflicts and make sure effective use of IP address space.

Step-by-Step Implementations:

Understand Network DHCP Management

DHCP management contains numerous key activities:

IP Address Allocation: Enthusiastically assigning IP addresses to devices as they add the network.
Lease Management: Handling the duration in lease time for which an IP address is allocated to a device.
Conflict Detection: Discovering and resolving IP address conflicts.
Reclaiming IP Addresses: Releasing and modifying IP addresses when devices leave the network or when their leases expire.

Set up a Network with DHCP Management Components

Make a network topology that contains a DHCP server and clients that will request IP addresses.

Example: Define a Network with DHCP Management in NED

network DHCPManagementNetwork {

submodules:

dhcpServer: DHCPServer; // Server responsible for IP address allocation

router: Router;

client1: Client;

client2: Client;

connections:

client1.out++ –> router.in++;

client2.out++ –> router.in++;

router.out++ –> dhcpServer.in++;

}

Implement DHCP Server Functionality

In the OMNeT++ module denoting the DHCP server, execute logic to manage DHCP requests, allocate IP addresses, and manage leases.

Example: Implementing a DHCP Server

#include <omnetpp.h>

#include <unordered_map>

#include <string>

using namespace omnetpp;

class DHCPServer : public cSimpleModule {

private:

std::unordered_map<std::string, std::pair<std::string, simtime_t>> dhcpTable; // MAC address to (IP address, lease time)

int ipAddressPool = 100; // Example IP address pool size

int allocatedIPCount = 0;

std::ofstream dhcpLogFile;

protected:

virtual void initialize() override {

// Open a log file to store DHCP allocation records

dhcpLogFile.open(“dhcp_log.txt”);

}

virtual void handleMessage(cMessage *msg) override {

// Handle DHCP requests from clients

if (strcmp(msg->getName(), “dhcpRequest”) == 0) {

std::string macAddress = msg->par(“macAddress”).stringValue();

std::string ipAddress = allocateIPAddress(macAddress);

simtime_t leaseTime = simTime() + 3600; // 1 hour lease time

dhcpTable[macAddress] = std::make_pair(ipAddress, leaseTime);

logDHCPAllocation(macAddress, ipAddress, leaseTime);

sendDHCPResponse(msg, ipAddress, leaseTime);

} else if (strcmp(msg->getName(), “dhcpRelease”) == 0) {

std::string macAddress = msg->par(“macAddress”).stringValue();

releaseIPAddress(macAddress);

}

std::string allocateIPAddress(const std::string& macAddress) {

// Check if the MAC address already has an IP address assigned

if (dhcpTable.find(macAddress) != dhcpTable.end()) {

return dhcpTable[macAddress].first;

}

// Generate a new IP address (simple example, incrementing last octet)

std::string newIPAddress = “192.168.1.” + std::to_string(allocatedIPCount + 1);

allocatedIPCount++;

return newIPAddress;

}

void sendDHCPResponse(cMessage *requestMsg, const std::string& ipAddress, simtime_t leaseTime) {

// Create a response message with the allocated IP address and lease time

cMessage *responseMsg = new cMessage(“dhcpResponse”);

responseMsg->addPar(“ipAddress”) = ipAddress.c_str();

responseMsg->addPar(“leaseTime”) = leaseTime.dbl();

send(responseMsg, “out”);

delete requestMsg;

}

void releaseIPAddress(const std::string& macAddress) {

// Release the IP address assigned to the MAC address

if (dhcpTable.find(macAddress) != dhcpTable.end()) {

dhcpTable.erase(macAddress);

allocatedIPCount–;

EV << “Released IP address for MAC: ” << macAddress << std::endl;

}

void logDHCPAllocation(const std::string& macAddress, const std::string& ipAddress, simtime_t leaseTime) {

// Log the DHCP allocation to the file

simtime_t currentTime = simTime();

dhcpLogFile << currentTime << ” – ” << “MAC: ” << macAddress << ” – IP: ” << ipAddress << ” – Lease Time: ” << leaseTime << std::endl;

EV << “Allocated IP ” << ipAddress << ” to MAC ” << macAddress << ” with lease time ” << leaseTime << std::endl;

}

virtual void finish() override {

// Close the DHCP log file at the end of the simulation

dhcpLogFile.close();

// Record the number of IP addresses assigned

recordScalar(“Total IP Addresses Allocated”, allocatedIPCount);

}

};

Define_Module(DHCPServer);

Implement Client DHCP Request Handling

Execute a client module that sends DHCP needs to the DHCP server and receives the assigned IP addresses and lease times.

Example: Implementing a Client

class Client : public cSimpleModule {

private:

std::string macAddress;

std::string assignedIPAddress;

simtime_t leaseTime;

protected:

virtual void initialize() override {

// Assign a unique MAC address to the client (for simplicity, use module name)

macAddress = getName();

// Request an IP address from the DHCP server

requestDHCP();

}

void requestDHCP() {

cMessage *requestMsg = new cMessage(“dhcpRequest”);

requestMsg->addPar(“macAddress”) = macAddress.c_str();

send(requestMsg, “out”);

}

virtual void handleMessage(cMessage *msg) override {

if (strcmp(msg->getName(), “dhcpResponse”) == 0) {

// Receive the assigned IP address and lease time

assignedIPAddress = msg->par(“ipAddress”).stringValue();

leaseTime = msg->par(“leaseTime”).doubleValue();

EV << “Client ” << macAddress << ” received IP address: ” << assignedIPAddress << ” with lease time: ” << leaseTime << std::endl;

delete msg;

}

virtual void finish() override {

// Record the assigned IP address and lease time for analysis

recordScalar((“Assigned IP for ” + macAddress).c_str(), assignedIPAddress.c_str());

recordScalar((“Lease Time for ” + macAddress).c_str(), leaseTime.dbl());

}

};

Define_Module(Client);

Simulate Network Traffic and DHCP Processes

Generate DHCP requests from the clients and observe how the DHCP server assigns IP addresses, manages leases, and handles IP address releases.

Example: Traffic Simulation with DHCP Requests

cpp

Copy code

class Client : public cSimpleModule {

protected:

virtual void initialize() override {

// Start the process by requesting an IP address

requestDHCP();

}

void requestDHCP() {

cMessage *requestMsg = new cMessage(“dhcpRequest”);

send(requestMsg, “out”);

}

};

Monitor and Analyse DHCP Management Data

The logs and metrics generated by the DHCP server and clients can be analysed to measure the efficiency of the DHCP management process. Key metrics contain:

IP Address Allocation Time: The time taken by the DHCP server to assign an IP address.
Lease Utilization: The proportion of the IP address pool that has been assigned.
Lease Renewal Rate: The rate at which clients renew their IP address leases.

Example: Calculating IP Address Allocation Time and Lease Utilization

class DHCPServer : public cSimpleModule {

private:

int totalIPAddresses = 100; // Assuming a fixed pool of 100 IP addresses

int allocatedIPAddresses = 0;

protected:

virtual void handleMessage(cMessage *msg) override {

if (strcmp(msg->getName(), “dhcpRequest”) == 0) {

allocatedIPAddresses++;

// Handle DHCP request…

}

virtual void finish() override {

double utilization = (double)allocatedIPAddresses / totalIPAddresses * 100.0;

recordScalar(“IP Address Utilization (%)”, utilization);

}

};

Analyse DHCP Management Effectiveness

Analyse the effectiveness of the DHCP management process by assessing after running the simulation,:

IP Address Allocation Efficiency: How efficiently IP addresses were assigned across the network.
Lease Management: How well the DHCP server handled leases and handled renewals or expirations.
Network Stability: The impact of DHCP management on network stability, involving conflict resolution and address reclamation.

Advanced DHCP Management Features

For extra complete DHCP management, we might need to:

Implement Dynamic IP Address Allocation: Dynamically assign and discharge IP addresses as devices connect and leave the network.
Simulate Lease Renewal and Expiry: Execute lease renewal processes and manage IP address expiry and reclamation.
Implement Conflict Detection and Resolution: Identify and resolve IP address conflicts in real-time.

Example Scenario

In the given example, the DHCPServer module manages DHCP requests from clients, assigns IP addresses, handles leases, and the DHCP management process is logged and analysed.

network DHCPManagementExample {

submodules:

dhcpServer: DHCPServer;

router: Router;

client1: Client;

client2: Client;

connections:

client1.out++ –> router.in++;

client2.out++ –> router.in++;

router.out++ –> dhcpServer.in++;

}

Post-Simulation DHCP Management Analysis

To observe the recorded DHCP management metrics, like IP address allocation times, lease utilization, and the overall success of the DHCP management process by using OMNeT++’s built-in analysis tools. This analysis will support to know how efficiently the network manages its IP address space and leases.

From the above details, we are comprehensively shown the process and examples to calculate the Network DHCP Management using OMNeT++. We will distribute further details based on your requirements. omnet-manual.com will assist you with the Network DHCP Management in omnet++ tool for your project, so please provide us with your parameter information. We continue to monitor network project performance based on your criteria by comparing parameter data.