I have 5 Orange Pi PC+ boards and all are running on Android 7.0 image.
But i am seeing same MAC address for eth0(ethernet) for all board.  
I am using my proprietary android app which communicate with server with REST API. I am getting mac address from eth0 using below method,

List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface nif : all) {

    if (nif.getName().equalsIgnoreCase("eth0")) {
        byte[] macBytes = nif.getHardwareAddress();


I am afraid that if 2 or more Orange Pi PC+ board in same netwok will create problem to comunicate server.

Is this know issue? Is there any solution to overcome this issue?

Please help. Thanks in advance.