Unfortunetly it doesn't work :( only default interface is used

private static final String defaultIP = "239.0.2.10"; <-this is changed
depended on interface number

  public void setInterface(NetworkInterface i){
       try {
           logger.info("MulticastAnnounce setting interface");

           this.address = InetAddress.getByName(defaultIP);
           this.socket = new MulticastSocket(port);
           this.socket.setNetworkInterface(i);
           this.socket.joinGroup(this.address);

           logger.info("MulticastSocket Annoucer success");

           this.socket = socket;

       }catch(Exception e){
           logger.error("Cannot set network Interface:"+e.toString());

       }