java - How to find the MAC address of Wi-Fi devices connected to socket -

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i developing web application acts server. in application have implimented serversocket 2 way communication between server application , wi-fi device acts client. not connecting server directly, connecting router port forwards system , 2 way communication successful. want find mac address of wi-fi device connected.i have done research , tried mac address failed.can me on this.below part of code.

public class schedulejob extends servletapp implements job{  private int port = 1717; public static string number; string receiveddata = "";  public void execute(jobexecutioncontext context)throws jobexecutionexception {     system.out.println("starting ... ");      serversocket sersocket = null;     system.out.println("starting socket server @ port:" +port);     boolean listeningsocket = true;     try {         sersocket = new serversocket(port);         system.out.println("waiting clients...");     } catch (ioexception e) {         system.err.println("could not listen on port: 1717");     }     try {          while (listeningsocket) {             socket scokt = sersocket.accept();              inetaddress machineadd = scokt.getinetaddress();             system.out.println("response-----:" +machineadd);             inetaddress ip = inetaddress.getlocalhost();             system.out.println("current ip : "+ip);             networkinterface network = networkinterface.getbyinetaddress(ip);              byte[] mac = network.gethardwareaddress();             system.out.print("current mac address : ");              stringbuilder sb = new stringbuilder();             (int = 0; < mac.length; i++) {                 sb.append(string.format("%02x%s", mac[i], (i < mac.length - 1) ? "-" : ""));                     }             system.out.println(sb.tostring());

mac address piece of information belongs layer 2 of osi model.

in other words it's not preserved whenever communicating using l3 protocol (until communicating directly via cross cable or via l2 switch).

i recommend send mac address part of application communication client server, not lost when router port forwarding.

some of asked questions on topic:


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