two network interface cards - udp socket creation

Hi,

I`ve two network interface cards installed on my computer. At both of
these cards, I want to install an udp socket with the same udp_port.

class MyThread:
    public SocketThread
{
};

class SocketThread :
    public CWinThread
{
};

BOOL MyThread::InitInstance()
{
                if(!SocketThread::InitInstance())
                       return FALSE;

                if(!m_socket.Create(PORT, SOCK_DGRAM, FD_READ))
    {
        DWORD err = ::GetLastError();
        m_pMainwnd->PostMessage(UWM_ADD_LOGFILE_ERROR, 0, (LPARAM) err);
        return FALSE;
    }

   return TRUE;
}

At the moment only the first socket (first Mythread::InitInstance()
call) will be created. The second one failed -> Getlasterror = 10048
(Only one usage of each socket address ...).

Maybe mfc doesn`t know that I have two network interface cards
installed on the computer and use always the same network card to
bound the port??? How could I acchieve that each network card will
have such an udp-socket installed / created successfully?

best regards
Hans