C# 如何使用UDPClient类从UDP数据包中检测目标IP地址

我正在开发一个应用程序，它在客户端应用程序和服务器应用程序之间通过UDP发送和接收消息

在我的服务器上，我有4个不同的网卡，例如nic1=169.524.15.12、nic2=169.524.15.65等。我的DNS指向nic2。客户端应用解析DNS并将数据发送到nic2。然而，我的服务器应用程序有时会从nic1响应客户端

我正在使用UdpClient侦听传入的数据包

这是我的服务器应用程序代码：

objSocketServer = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
EndPoint objEndPointOfServer =   new IPEndPoint(IPAddress.Any, 5000);
objSocketServer.Bind(objEndPointOfServer);
objSocketServer.BeginReceiveFrom(_arrReceivedDataBuffer, 0, BUFSIZE - 1, SocketFlags.None, ref objEndPointOfServer, DoReceiveFromClient, objSocketServer);

private void DoReceiveFromClient(IAsyncResult objIAsyncResult)
{
        try
        {
             // Get the received message.
            _objSocketReceivedClient = (Socket)objIAsyncResult.AsyncState;
            EndPoint objEndPointReceivedClient = new IPEndPoint(IPAddress.Any, 0);

            // Received data.
            int intMsgLen = _objSocketReceivedClient.EndReceiveFrom(objIAsyncResult, ref objEndPointReceivedClient);
            byte[] arrReceivedMsg = new byte[intMsgLen];
            Array.Copy(_arrReceivedDataBuffer, arrReceivedMsg, intMsgLen);

            // Client port.
            // Get and store port allocated to server1 while making request from client to server.
            int _intClientServer1Port = ((IPEndPoint)objEndPointReceivedClient).Port;

            // Send external ip and external port back to client.
            String strMessage = ((IPEndPoint)objEndPointReceivedClient).Address.ToString() + ":" + _intClientServer1Port.ToString();
            byte[] arrData = Encoding.ASCII.GetBytes(strMessage);
            objSocketServer.SendTo(arrData, arrData.Length, SocketFlags.None, objEndPointReceivedClient);

            // Start listening for a new message.
            EndPoint objEndPointNewReceivedClient = new IPEndPoint(IPAddress.Any, 0);
            objSocketServer.BeginReceiveFrom(_arrReceivedDataBuffer, 0, _arrReceivedDataBuffer.Length, SocketFlags.None, ref objEndPointNewReceivedClient, DoReceiveFromClient, objSocketServer)
        }
        catch (SocketException sx)
        {
                objSocketServer.Shutdown(SocketShutdown.Both);
                objSocketServer.Close();
        }
     }
}

在代码中，是否有任何方法可以检测到我已在服务器上的哪个IP地址上接收到数据包，并使用相同的IP地址进行回复

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可以说，我也可以在服务器应用程序中解析DNS，并确保我的服务器应用程序只侦听客户端应用程序发送数据包的IP，但是，当我的服务器应用程序必须侦听>1 IP时，这种方法将不适用于我。

SendTo命令将为提供的目标地址使用适当的NIC aka本地接口。系统指标决定了这一点。这不是您在代码中设置的内容。要查看系统指标，请运行命令netstat-rn并查看Interface列。如果你打领带的话，你需要调整一下。您也可以使用GetAllNetworkInterfaces在代码中枚举它们，并绑定到特定的接口（如果您需要的话）