└── Serverarp12.java


/Serverarp12.java:
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 1 | import java.io.*;
 2 | import java.net.*;
 3 | import java.util.*;
 4 | class Serverarp12
 5 | {
 6 |             public static void main(String args[])
 7 |             {
 8 |             try
 9 |             {
10 |                         DatagramSocket server=new DatagramSocket(1309);
11 |                         while(true)
12 |                         {
13 |                                     byte[] sendbyte=new byte[1024];
14 |                                     byte[] receivebyte=new byte[1024];
15 |                                     DatagramPacket receiver=new DatagramPacket(receivebyte,receivebyte.length);
16 |                                     server.receive(receiver);
17 |                                     String str=new String(receiver.getData());
18 |                                     String s=str.trim();
19 |                                     //System.out.println(s);
20 |                                     InetAddress addr=receiver.getAddress();
21 |                                     int port=receiver.getPort();
22 |                                     String ip[]={"165.165.80.80","165.165.79.1"};
23 |                                     String mac[]={"6A:08:AA:C2","8A:BC:E3:FA"};
24 |                                     for(int i=0;i<ip.length;i++)
25 |                                     {
26 |                                                 if(s.equals(ip[i]))
27 |                                                 {
28 |                                                             sendbyte=mac[i].getBytes();
29 |                                                             DatagramPacket sender=new DatagramPacket(sendbyte,sendbyte.length,addr,port);
30 |                                                             server.send(sender);
31 |                                                             break;
32 |                                                 }
33 |                                     }
34 |                                     break;
35 | 
36 | 
37 |                         }
38 |             }
39 |             catch(Exception e)
40 |             {
41 |                         System.out.println(e);
42 |             }
43 |             }
44 | }


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