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POWindows 7 upgrade, UDP Broadcast issue
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copied!<p>I am new to this environment as far as UDP protocols and sending/receiving data via networks. I have read the other post regarding this kind of issue but I am not sure how to fix my problem:</p> <p>I have just upgraded a PC to Windows 7 from XP. This upgrade was due to my application needs to run on Win7. I have NOT changed the was our UDP stream is broadcasted. With the upgrade I can no longer run the older version of my application becasue the UDP stream doesn't seam to get to my application.</p> <p>I have turned off all firewalls and am running everything as admin. </p> <p>This is how my setup is:</p> <p>Code is running on ip: 192.168.2.1 UDP is sent from 192.168.2.1 to 192.168.2.87 and then broadcasted to 192.168.2.255</p> <p>I used to be able to see this UDP stream with my old application on a seperate computer: 192.168.2.12</p> <p>If I change my UDP stream to go directly to 192.168.2.12 ip, then my application works, but then the UDP is not broadcasted anymore. I need the UDP to be able to be read by more than one computer. </p> <p>Here is my wireshark out put for the UDP Stream:</p> <pre><code>Source: 192.168.2.87 Destination: 192.168.2.255 Protocol: UDP Info: Sorce Port: 6601 Destination Port: 6601 </code></pre> <p>I have tried hard coding my c-code to listen to any possibility I can think of, aka the sender addr function:</p> <pre><code>senderAddr.sin_addr.s_addr = htonl(INADDR_ANY); </code></pre> <p>To something like: </p> <pre><code> senderAddr.sin_addr.s_addr = inet_addr("192.168.2.212") </code></pre> <p>This is the code to init the I/O buffer: </p> <pre><code>// UDP Receiver Declarations - SOCKET SockIn = INVALID_SOCKET; SOCKADDR_IN senderAddr; int senderSize = sizeof(senderAddr); u_short PortIn = 6601; int timeout = 1; //===================<Callbacks::Callbacks>================== // // Summary: Constructor // //============================================================================= Callbacks::Callbacks(RTUserIntegrationI &a_rIntegration) : m_rIntegration(a_rIntegration) , m_pUDPInput(NULL) { } //=====================<Callbacks::~Callbacks>=============== // // Summary: Destructor // //============================================================================= Callbacks::~Callbacks() { } //=====================<Callbacks::InitIOBuffers>==================== // // Summary: Init function for the IO buffer // //============================================================================= void Callbacks::vInitIOBuffers() { BOOL bOptVal = TRUE; int bOptLen = sizeof(BOOL); WSADATA WSAData; UInt Size = 0; // UDP Declarations - // Initialize the member pointers to buffers bufferin = m_rIntegration.pGetIOBuffer(Input_Buffer); if (bufferin != NULL) m_pUDPInput = static_cast<InputData*>(bufferin->pGetDataAddress(Size)); // UDP Receive - if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0) { printf("\nCould not open WSA connection"); WSACleanup(); } SockIn = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (SockIn == INVALID_SOCKET) { printf("\nCould not create socket."); closesocket(SockIn); WSACleanup(); } senderAddr.sin_family = AF_INET; senderAddr.sin_port = htons(PortIn); senderAddr.sin_addr.s_addr = htonl(INADDR_ANY); if (setsockopt(SockIn, SOL_SOCKET, SO_REUSEADDR, (char*)&bOptVal, bOptLen) != INVALID_SOCKET) { printf("\nSet SO_REUSEADDR: ON."); } if (bind(SockIn, (struct sockaddr *) &senderAddr, senderSize) == -1) { printf("\nCould not bind socket."); closesocket(SockIn); WSACleanup(); } setsockopt(SockIn, SOL_SOCKET, SO_RCVTIMEO, (char*) &timeout, sizeof(timeout)); } </code></pre> <p>I have the receive port number hard coded to 6601.</p> <p>The code above works fine and the computer sees and reads the broadcasted UDP in Windows XP but ceases to work in Windows 7. </p> <p>Any suggestions would be greatly appreciated.</p> <p>ADDED:</p> <p>192.168.2.1 generates the UDP stream--->sent to 192.168.2.87---> broadcasted on 192.168.2.255 ---> Notheing has changed on any of those computers....... I then have two computers (one XP and one Windows 7) than listen to the 2.255 ip. XP is getting the UDP and Win7 is not.</p>

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