绑定到特定接口的数据报套接字未在Java中接收。但是UDP可以完美地接收数据

Question

我正在尝试从UDP服务器获取数据。我已经将客户端udp套接字用于从UDP服务器接收数据。完全可以通过wire-shark获取数据，但是udp.receive（package）无法获取数据。

我已经尝试过不同的IP，例如192.168.0.252是鲨鱼和我的本地IP（127.0.0.1）中的源。我也尝试过不带界面。

      NetworkInterface nif = NetworkInterface.getByName("enp2s0");

    if(nif==null){
        System.err.println("Error getting the Network Interface");
        return;
    }
    System.out.println("Preparing to using the interface: "+nif.getName());
    Enumeration<InetAddress> nifAddresses = nif.getInetAddresses();
    InetSocketAddress inetAddr= new InetSocketAddress("127.0.0.1",6723);

    //socket.bind(new InetSocketAddress(nifAddresses.nextElement(), 0));
    this.udpSocket = new DatagramSocket(inetAddr);
    System.out.println("Interface setted");

//直到此代码被完美初始化

        byte[] buf = new byte[1024];
        DatagramPacket packet = new DatagramPacket(buf, buf.length);

        // blocks until a packet is received
        udpSocket.receive(packet);
       //Data stucking here
        msg = new String(packet.getData()).trim();

        System.out.println(
                "Message from " + packet.getAddress().getHostAddress() + ": " + msg);

代码保持运行状态，但不接收数据