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Bind a socket (including UdpClient and TcpClient) to a local network interface card (NIC)

/ Published in: C#
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If you are using a UdpClient or TcpClient, you have access to the internal Socket which either type uses. Unfortunately, if you try to Bind that Socket to a local Endpoint (IPAddress and Port), you will probably get a SocketException. The solution I found is to create the Socket independently, then assign that instance to the UdpClient (as shown in the code) or TcpClient (changing the Socket parameters, of course).

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  1. using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
  2. {
  3.     var endPoint = new IPEndPoint(ip, port);
  4.     socket.Bind(endPoint);
  5.     using (var client = new UdpClient() {Client = socket})
  6.     {
  7.         var destinationIP = IPAddress.Broadcast;
  8.         client.Connect(destinationIP, port);
  9.         client.Send(bytes, bytes.Length);
  10.     }
  11. }

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