Re: luasocket unstable IPV6_V6ONLY undefined in mingw

[Ross Bencina <rossb-lists@...>]

On 8/04/2013 7:02 AM, William Ahern wrote:
> IPV6_V6ONLY is a socket option (setsockopt(3)) originating with the
> Basic Socket Interface Extensions for IPv6 (RFC 3493).
>
> 	http://tools.ietf.org/html/rfc3493.html#page-22
>
> On BSDs the value of this option is `27'. Defining it to `1' is probably
> wrong. It may do the right thing with #ifdef guarded code, but it may result
> in weird things happening if the option is actually used.

Just to confirm, on Windows IPV6_V6ONLY is also 27. From Ws2ipdef.h in 
the Windows SDK:

#define IPV6_V6ONLY           27 // Treat wildcard bind as AF_INET6-only.

Note that Windows XP doesn't support dual stack sockets, and this flag 
has the opposite default than on most Unices.


http://msdn.microsoft.com/en-us/library/windows/desktop/ms738574(v=vs.85).aspx

See also the note here:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms737937(v=vs.85).aspx


http://stackoverflow.com/questions/2693709/what-was-the-motivation-for-adding-the-ipv6-v6only-flag

Not that I know more than that, but I was curious so looked it up.

Ross.