title: UDP malformed packets
body: <p>I use C# program for client UDP application. Application listens for a connection, and then communicates. </p>
  
  <pre><code>Socket udpClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
  udpClient.Bind(new IPEndPoint(IPAddress.Any, ListenPort));
  udpClient.Blocking = true;
  int count = 0;
  
  while (count == 0) udpClient.ReceiveFrom(receiveBuffer, ref ePoint);
  udpClient.SendTo(data, endPoint);
  udpClient.ReceiveFrom(receiveBuffer, ref ep);
  ...
  </code></pre>
  
  <p>I use Wireshark to debug the application. The problem is that after sometime my application starts sending malformed STUN packets, and I think that because of that they get rejected by a router on the internet.</p>
  
  <p>The question: is it possible to prevent sending malformed UDP/STUN packets?</p>