~cpp
int _cdecl main(int argc, char **argv)
{
    SOCKET        s;
    WSADATA       wsd;
    SOCKADDR_IN   if0;
    int           ret,
                  count;
    unsigned int  optval;
    DWORD         dwBytesRet,
                  dwFlags,
                  nproc;
    char          rcvbuf[MAX_IP_SIZE];
    WSABUF        wbuf;

    // Load Winsock
    //
    if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
    {
        printf("WSAStartup() failed: %d\n", GetLastError());
        return -1;
    }
    // Parse the command line
    //
    ValidateArgs(argc, argv);
    if (bFilter)
    {
        printf("Source Port: %d\n", usSourcePort);
        printf("Dest   Port: %d\n", usDestPort);
    }
    // Create a raw socket for receiving IP datagrams
    //
    s = WSASocket(AF_INET, SOCK_RAW, IPPROTO_IP, NULL, 0, WSA_FLAG_OVERLAPPED);
    if (s == INVALID_SOCKET)
    {
        printf("WSASocket() failed: %d\n", WSAGetLastError());
        return -1;
    }
    // Get an interface to read IP packets on
    //
    if (GetInterface(s, &if0, dwInterface) != 0)
    {
        printf("Unable to obtain an interface\n");
        return -1;
    }
    printf("Binding to IF: %s\n", inet_ntoa(if0.sin_addr));
    //
    // This socket MUST be bound before calling the ioctl
    //
    if0.sin_family = AF_INET;
    if0.sin_port = htons(0);

    if (bind(s, (SOCKADDR *)&if0, sizeof(if0)) == SOCKET_ERROR)
    {
        printf("bind() failed: %d\n", WSAGetLastError());
        return -1;
    }
    //
    // Set the SIO_RCVALLxxx ioctl
    //
    optval = 1;
    if (WSAIoctl(s, SIO_RCVALL, &optval, sizeof(optval),
            NULL, 0, &dwBytesRet, NULL, NULL) == SOCKET_ERROR)
    {
        printf("WSAIotcl(%d) failed; %d\n", dwIoControlCode,
            WSAGetLastError());
        return -1;
    }
    // Start receiving IP datagrams until interrupted
    // 
    count = 0;
    while (1)
    {
        wbuf.len = MAX_IP_SIZE;
        wbuf.buf = rcvbuf;
        dwFlags  = 0;

        ret = WSARecv(s, &wbuf, 1, &dwBytesRet, &dwFlags, NULL, NULL);
        if (ret == SOCKET_ERROR)
        {
            printf("WSARecv() failed: %d\n", WSAGetLastError());
            return -1;
        }
        // Decode the IP header
        //
    }
    // Cleanup
    //
    closesocket(s);
    WSACleanup();
    return 0;
}

���기��� 같��� 기������ ����� ���로그램과 다른 ������ ��로 ���다. (Listen과 accept가 ���������. WSAIoctrl������ 다 ���리���는������...) 단��� ��������� ioctrl 로 ������������ ip ������������ ���라���는 ��������� 기���과 다르게 ���리��� 뿐���다.
SIO_RCVALL ��� ��������� NIC를 ������ ���라���는 모든 ��������� ������가 가능���다. NIC를 ������ 나가는 ��������� ������������ 못���는 듯 ���다.

������� listen, accept 가 ������ ������링��� ���는 것���로 보���는데 dst ���관������ 무���겁 application 까��� ���라�����깐 ���������는 것��� ���닐까? 그런 ���각���고 ������. - eternalbleu