SimpleRARP.java

import java.util.*;

public class SimpleRARP {
    public static void main(String[] args) {
        HashMap<String, String> rarpTable = new HashMap<>();
        Scanner sc = new Scanner(System.in);
        
        // RARP Server entries (MAC -> IP)
        rarpTable.put("AA:BB:CC:DD:EE:01", "192.168.1.10");
        rarpTable.put("AA:BB:CC:DD:EE:02", "192.168.1.20");
        
        System.out.println("RARP PROTOCOL DEMO");
        System.out.println("===================");
        
        System.out.print("Enter your MAC address: ");
        String mac = sc.nextLine();
        
        // RARP Resolution
        System.out.println("\nRARP Request: What is my IP? My MAC is " + mac);
        
        if (rarpTable.containsKey(mac)) {
            String ip = rarpTable.get(mac);
            System.out.println("RARP Reply: Your IP address is " + ip);
            System.out.println("\nDevice configured with IP: " + ip);
        } else {
            System.out.println("No RARP reply - Cannot assign IP!");
        }
        
        // Display RARP Server Table
        System.out.println("\nRARP Server Table:");
        System.out.println("MAC\t\t\tIP");
        for (Map.Entry<String, String> e : rarpTable.entrySet()) {
            System.out.println(e.getKey() + "\t" + e.getValue());
        }
        
        sc.close();
    }
}