return 30000; // 30 seconds
    }

    private List<NetworkInterface> getAvailableNetworkInterfaces() {
        try {
            List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
            interfaces.removeIf(ni -> {
                try {
                    return ni.isLoopback() || !ni.isUp() || ni.isVirtual();
                } catch (Exception e) {

    }

    private void discoverLocalInterfaces() {
        localInterfaces.clear();

        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();

            while (interfaces.hasMoreElements()) {
                NetworkInterface ni = interfaces.nextElement();

                if (!ni.isUp() || ni.isLoopback() || ni.isVirtual()) {

  private static ImmutableSet<String> getMachineScopesAndInterfaces() throws SocketException {
    ImmutableSet.Builder<String> builder = ImmutableSet.builder();
    Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
    assertTrue(interfaces.hasMoreElements());
    while (interfaces.hasMoreElements()) {
      NetworkInterface i = interfaces.nextElement();
      builder.add(i.getName()).add(String.valueOf(i.getIndex()));

    }
    
    private void discoverLocalInterfaces() {
        localInterfaces.clear();
        
        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            
            while (interfaces.hasMoreElements()) {
                NetworkInterface ni = interfaces.nextElement();