Microsoft KB Archive/174158

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PRB: MSG_OOB and MSG_DONTROUTE Not Supported Over IPX Sockets


The information in this article applies to:

  • Microsoft Win32 Application Programming Interface (API), included with:
    • Microsoft Windows 95


When you use the WinSock send() or sendto() APIs on Windows 95 to send over an IPX/SPX socket, the MSG_DONTROUTE and MSG_OOB flags are not supported.

With the version of WSIPX (Windows Sockets support for IPX/SPX) that ships with Windows 95, setting these flags will have no effect. However, with newer versions of WSIPX the call will fail if these flags are set. GetLastError() will return WSAEOPNOTSUPP (error 10045).


There is no implementation provided in the IPX/SPX Compatible protocol for handling Out-Of-Band (Urgent) data, or for making IPX packets non-routable.


When using IPX/SPX sockets and calling send() or sendto(), do not set the MSG_DONTROUTE or MSG_OOB flags.


This behavior is by design.


Additional query words:

Keywords : kbnetwork kbAPI kbSDKPlatform kbOSWin95 kbWinsock kbGrpDSNet
Issue type : kbprb
Technology : kbAudDeveloper kbWin32sSearch kbWin32API

Last Reviewed: December 17, 2000
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