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POIs there a way to for UDP .net socket to release a bound port when the socket is closed?
 

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  1. POIs there a way to for UDP .net socket to release a bound port when the socket is closed?
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    <p>For this question, I'm running windows 7 64 bit, .net framework 3.5 </p> <p>What I really want to know is </p> <ol> <li>Is there a way to unbind/release a port that has been bound?</li> <li>When I set the socketoption reuse address I am able to bind to the port but I never receive data using that address/port?</li> </ol> <p>I'm looking at what ports are bound using netstat -apd udp </p> <p>The test code I'm using is below, normally I would not close the port after receiving one packet. </p> <pre><code>EndPoint endpoint = new IPEndPoint(state.IPAddress, state.Port); Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,ProtocolType.Udp); socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true); socket.Bind(endpoint); ReadStateObject stateObject = new ReadStateObject(); stateObject.socket = socket; stateObject.Port = state.Port; stateObject.IPAddress = state.IPAddress; stateObject.BurstDataReceivedEvent = state.BurstDataReceivedEvent; stateObject.shutdownRequested = state.StopRequestedEvent; socket.BeginReceiveFrom(stateObject.buffer, 0, stateObject.buffer.Length, SocketFlags.None, // Was 0 which is likely the same enumeration but this is clearer ref endpoint, new AsyncCallback(BurstUdpListener.SocketBeginReceiveAsyncCallback), stateObject); // wait for read to complete... or the thread to be asked to stop while (stateObject.readFinished.WaitOne(100, false) == false) { // has this thread been requested to stop? if so, cancel the pending read if (state.StopRequestedEvent.WaitOne(1, false) == true) { stop = true; break; } } socket.Shutdown(SocketShutdown.Both); socket.Close(); socket = null; private static void SocketBeginReceiveAsyncCallback(IAsyncResult ar) { if (ar.IsCompleted) { ReadStateObject state = ar.AsyncState as ReadStateObject; if (state != null) { if (state.shutdownRequested.WaitOne(1, false)) return; EndPoint endpoint = new IPEndPoint(state.IPAddress, state.Port); int bytesReceived = state.socket.EndReceiveFrom(ar, ref endpoint); // for some reason throws error here on changes to settings if (state.BurstDataReceivedEvent != null) { state.BurstDataReceivedEvent(null, new BurstDataReceivedEventArgs(state.buffer, bytesReceived)); } state.readFinished.Set(); } } } </code></pre>
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    1. USJames McLaughlin
    1. USSeanV
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      1. POIs there a way to for UDP .net socket to release a bound port when the socket is closed?
      1. USafrischke
      1. VTFavorite
    1. COUDP is a connectionless protocol. This question makes no sense.
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      1. POIs there a way to for UDP .net socket to release a bound port when the socket is closed?
      1. USChris Eberle
    2. COThe port is still bound when I close the socket as netstat shows me. When I attempt to rebind I'll get in in use exception, unless I have reuse address socket option set. That makes sense. If I have reuse address socket option set I never recieve the packets the after closing and opening/binding to the port.
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      1. POIs there a way to for UDP .net socket to release a bound port when the socket is closed?
      1. USSeanV
    3. COEdited the question to get rid of connection as you are correct that UDP is a connectionless protocol. What I really want to know is 1) Is there a way to unbind/release a port that has been bound. 2) When I set the socketoption reuse address I am able to bind to the port but I never receive data using that address/port.
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      1. POIs there a way to for UDP .net socket to release a bound port when the socket is closed?
      1. USSeanV
 

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