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Date:      Mon, 22 May 2017 14:13:18 +0200
From:      Alarig Le Lay <alarig@swordarmor.fr>
To:        William Gathoye <william@gathoye.be>
Cc:        "Andrey V. Elsukov" <bu7cher@yandex.ru>, freebsd-net@freebsd.org
Subject:   Re: Public IPv6s fail on KVM bridge with "No buffer space available"
Message-ID:  <20170522121318.2pzqt5ryisrl44rn@mew.swordarmor.fr>
In-Reply-To: <a44fa8c5-d48f-25eb-51d2-16d100ba5f53@gathoye.be>
References:  <fbfe1ff2-bd66-9a98-d56b-6d75265936bd@gathoye.be> <84cecdc7-e331-d3bc-3fb3-e35507e231d6@yandex.ru> <a44fa8c5-d48f-25eb-51d2-16d100ba5f53@gathoye.be>

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On lun. 22 mai 14:03:54 2017, William Gathoye wrote:
> Btw, if I wanted to use link local addresses to communicate with the
> provider next hop gateway, how can I know the local link fe80 IPv6
> address of that gateway since my provider (OVH) doesn't disclose it?

You can try to ping6 the IPv6 multicast address for all the routers on
the link:

14:07 alarig@mew ~ % ping6 -c1 ff02::2%vtnet0
PING6(56=3D40+8+8 bytes) fe80::a800:ff:fe93:83a3%vtnet0 --> ff02::2%vtnet0
16 bytes from fe80::209%vtnet0, icmp_seq=3D0 hlim=3D64 time=3D0.237 ms

--- ff02::2%vtnet0 ping6 statistics ---
1 packets transmitted, 1 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev =3D 0.237/0.237/0.237/0.000 ms

But, it=E2=80=99s possible that you don=E2=80=99t get any reply if they do =
some nasty
things on their network (as Hetzner does). In that case, you=E2=80=99re stu=
ck on
the /56 setup.

--=20
alarig

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