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POCommunication betwen Client and Servver running on two different machines using UDP Sockets in C using Visual studio 2008
 

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  1. POCommunication betwen Client and Servver running on two different machines using UDP Sockets in C using Visual studio 2008
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    <p>I have developed an application in which a client and server can communicate with eachother using UDP Sockets. I have used loop Back address on Client side and INADDR_ANY for the Server Side. The program works fine on the same machine. But when I tried to run the Client from a different machine, the communication failed. here is the code snippet: <strong>SERVER:</strong></p> <pre><code> #define PORT 8888 //The port on which to listen for incoming data if (WSAStartup(MAKEWORD(2,2),&amp;wsa) != 0) { exit(EXIT_FAILURE); } ///Create a socket/// if((socketIdentifier = socket(AF_INET , SOCK_DGRAM , 0 )) == INVALID_SOCKET) { //"Socket not created" } ///Socket Created/// ///Prepare the sockaddr_in structure/// serverSocket.sin_family = AF_INET; serverSocket.sin_addr.s_addr = INADDR_ANY; serverSocket.sin_port = htons( PORT ); ///Bind/// if( bind(socketIdentifier ,(struct sockaddr *)&amp;serverSocket , sizeof(serverSocket)) == SOCKET_ERROR) { //"Bind Failed" } ///Bind Done/// if((recv_len = recvfrom(socketIdentifier, receiveBuffer, sizeof(receiveBuffer), 0, (struct sockaddr *) &amp;clientSocket, &amp;clientSocketLength)) == SOCKET_ERROR) { "Could not Receive Data" } hDeviceContext = BeginPaint(AH_Glb_windowHandle, &amp;ps ); TextOut(GetDC(AH_Glb_windowHandle),10,10+i,receiveBuffer,recv_len); EndPaint( AH_Glb_windowHandle, &amp;ps ); </code></pre> <p><strong>CLIENT:</strong></p> <pre><code> #define PORT 8888 //The port on which to listen for incoming data #define SERVER "58.65.172.11" //ip address of udp server ///Initialise winsock/// if (WSAStartup(MAKEWORD(2,2),&amp;wsa) != 0) { //Socket Initialization Failed/// exit(EXIT_FAILURE); } ///create socket/// if ((socketIdentifier=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == SOCKET_ERROR) { ///Socket Creation Failed/// exit(EXIT_FAILURE); } ///setup address structure/// memset((char *) &amp;connectedSocket, 0, sizeof(connectedSocket)); connectedSocket.sin_family = AF_INET; connectedSocket.sin_port = htons(PORT); connectedSocket.sin_addr.S_un.S_addr = inet_addr(SERVER); if (sendto(socketIdentifier,sendBuffer,strlen(sendBuffer) , 0 , (struct sockaddr *) &amp;connectedSocket, sizeof(connectedSocket)) == SOCKET_ERROR) { MessageBox(NULL, "Sending Failed", "Failure", MB_ICONINFORMATION); exit(EXIT_FAILURE); } </code></pre>
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    1. COPlease Help me, I am waiting for response
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    2. COI was using [what is my IP website](http://www.whatismyip.com/) to find the IP of machine on which Server is running. If the Client communicates on IP address generated by this website, the communication didn't work. But when i used ipconfig command to find IP of Server's machine, the IP address i found was different from that generated by [what is my IP website](http://www.whatismyip.com/), and now when i tried to communicate from Client at Server's Ip address generated by ipconfig, the communication worked. can any body explain me how that happened?
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    3. COCan anybody tell me? :(
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