在IPv6（NAT64）环境中，networkStream.BeginRead不起作用

Question

以下代码在IPV4中运行良好，并且，在IPv6（NAT64）环境中，它可以连接服务器并发送消息成功，它可以从服务器捕获数据，但是，回调 OnRead 永远不会被执行。

很长一段时间以来一直困扰着我。

private TcpClient client = null;
private const int MAX_READ = 8192;
private NetworkStream outStream = null;
private byte[] byteBuffer = new byte[MAX_READ];


public void ConnectServerByIP(string ip, int port) {

    client = new TcpClient(AddressFamily.InterNetworkV6);


    client.SendTimeout = 1000;
    client.ReceiveTimeout = 1000;
    client.NoDelay = true;

    IPAddress ipAddr = IPAddress.Parse(ip);

    try {
        client.BeginConnect(ipAddr, port, new AsyncCallback(OnConnect), null);
    } catch (Exception e) {
        Close(); Debug.LogError(e.Message);
    }

}

void OnConnect(IAsyncResult asr) {
    outStream = client.GetStream();

    client.GetStream ().BeginRead (byteBuffer, 0, MAX_READ,new  AsyncCallback(OnRead), null);

    NetworkManager.AddEvent(Protocal.Connect, new ByteBuffer());
}

void OnRead(IAsyncResult asr) {
    Debug.Log ("Hello~");
}