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Date: Thu, 31 Mar 2016 13:57:36 +0200
From: Samuel Thibault <samuel.thibault@gnu.org>
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Subject: Re: [Qemu-devel] [PULL 0/5] ipv4-only and ipv6-only support
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To: Vasiliy Tolstov <v.tolstov@selfip.ru>
Cc: Peter Maydell <peter.maydell@linaro.org>, QEMU Developers <qemu-devel@nongnu.org>, "J. Kiszka" <jan.kiszka@siemens.com>

Vasiliy Tolstov, on Thu 31 Mar 2016 14:49:35 +0300, wrote:
> Yes, i'm using older version of this patch and without working ipv6 on
> host my vm tries to access network via ipv6 (prefered) and not able to
> connect.

I'm surprised that the vm tries to access the network via ipv6 by
default.  Which OS is this?  With the default fec0:: prefix, ipv4
should be preferred.  Latest versions of the patch (which was commited)
also make qemu send a net unreachable icmpv6 response when ipv6 is not
available on the host, so that the guest knows without delay that ipv6
is not actually available.

Samuel