[Async-sig] AI_V4MAPPED on Windows

[Guido van Rossum]

Hi Jan,

Thanks for your feedback. However, this list is not for reporting asyncio
bugs. Please use the Python bug tracker to report issues in asyncio.
bugs.python.org.

--Guido

On Sun, Feb 3, 2019 at 5:02 AM Jan Seeger <jan.seeger at thenybble.de> wrote:

> Greetings!
>
> I'm working with aiocoap, which uses the AI_V4MAPPED flag to use
> IPv4-mapped
> addresses for dual-stack support. When trying to run on Windows,
> creating a
> connection fails, because the socket option IPV6_V6ONLY is set to true
> per default on Windows, whereas the value is configurable on Linux.
> I've attached a file that should reproduce the error.
>
> A possible fix would be calling socket.setsockopt(socket.IPPROTO_IPV6,
> socket.IPV6_V6ONLY, False) when V4-mapped addresses have been requested
> (this bug can also appear on Linux when /proc/sys/net/ipv6/bindv6only
> contains 1).
>
> If you require any more information, feel free to contact me!
>
> Best Regards,
>
> Jan Seeger
>
> PS: I am not a subscriber of this list, so please leave my address on
> any
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-- 
--Guido van Rossum (python.org/~guido)
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