code: @Override
      protected InetAddress isAcceptable(NetworkInterface networkInterface, InetAddress address) throws SocketException {
  
          if( networkInterface.isPointToPoint() )
              return address;
          return null;
      }
docs: {@inheritDoc}
  
  @return <code>address</code> if <code>networkInterface</code> is a
  {@link NetworkInterface#isPointToPoint() point-to-point interface}.