Thread: WinSock error 10049

  1. #1
    Registered User
    Join Date
    Nov 2008

    WinSock error 10049

    I am trying to do raw sockets on Windows 7. In runtime when I do
    // Initialize Winsock
    	iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    	if (iResult != 0) {
    		printf("WSAStartup failed: %d\n", iResult);
    		return 1;
    	// Create a SOCKET for connecting to server
    	sd = WSASocket(AF_INET, SOCK_RAW, IPPROTO_TCP, 0, 0, 0);
        if (sd == INVALID_SOCKET) {
            printf("Error at socket(): %ld\n", WSAGetLastError());
            return 1;
    	int val = 1;
    	if (setsockopt(sd, IPPROTO_IP, IP_HDRINCL, (const char*)&val, 
                sizeof(val)) == SOCKET_ERROR) {
            printf("IP_HDRINCL setsockopt failed: %ld\n", WSAGetLastError());
            return 1;
    I get "IP_HDRINCL setsockopt failed: 10049". 10049 is documented as Cannot assign requested address. I'm not trying to bind, so it's odd that this is my error num. What could be causing this error?

  2. #2
    Join Date
    Dec 2007
    From here:

    Limitations on Raw Sockets

    On Windows 7, Windows Server 2008 R2, Windows Vista, and Windows XP with Service Pack 2 (SP2), the ability to send traffic over raw sockets has been restricted in several ways:

    * TCP data cannot be sent over raw sockets.
    * UDP datagrams with an invalid source address cannot be sent over raw sockets. The IP source address for any outgoing UDP datagram must exist on a network interface or the datagram is dropped. This change was made to limit the ability of malicious code to create distributed denial-of-service attacks and limits the ability to send spoofed packets (TCP/IP packets with a forged source IP address).
    * A call to the bind function with a raw socket is not allowed.

    These above restrictions do not apply to Windows Server 2008 , Windows Server 2003, or to versions of the operating system earlier than Windows XP with SP2.

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