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I have vague recollections of figuring this.

The archives might have it. Try this from 2008

On 30/06/2014 04:01, Milind Gupta wrote:
> Hi,
>         I was trying out a multicast UDP socket but I cannot use
> IP_ADD_MEMBERSHIP the setoption method fails
> (sckt:setoption("ip-add-membership",{multiaddr="",interface="*"})).
> The source code mentions that they have a problem. It seems that if
> winsock.h is included it works otherwise they are undefined.
>     Is there any other way to do this or would I have to modify the
> LuaSocket code to make it work?
> Thanks,
> Milind