From owner-freebsd-net@freebsd.org Wed May 24 10:18:01 2017 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 39AF0D7B347 for ; Wed, 24 May 2017 10:18:01 +0000 (UTC) (envelope-from william@gathoye.be) Received: from mail-wm0-x242.google.com (mail-wm0-x242.google.com [IPv6:2a00:1450:400c:c09::242]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id BFCEB1D07 for ; Wed, 24 May 2017 10:17:59 +0000 (UTC) (envelope-from william@gathoye.be) Received: by mail-wm0-x242.google.com with SMTP id b84so30346172wmh.0 for ; Wed, 24 May 2017 03:17:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gathoye-be.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id :disposition-notification-to:date:user-agent:mime-version :in-reply-to; bh=H0PpflmJAvL1J7xN0KN1SL01lAS9oTKcFJbYss8hxfk=; b=zZqQOIx1d4MIlzoY/sBs9xuVH+yo2PjmfSbvkBwvRjZdFvidDL1UxJiqWhg8GBQeAb CkspJUDB0ZDQI2Jd4rHfzQSegdSEJkK6kg0uEOjbo6JGbBocnq9xTYtlt6SC9pp+Q4fF aotDQ5g0wEc5mlPTCJBG6MWBsP1wopY95zM29cRSR/kA0NYuTn4Mo4cmxkjxIlDUQiUF mSExlF59rz5bIO7cSLjdbBZ1bBrGJFnPoWLU85cxf3+p3bBvgcV89FAbfAV6PuDUO2Iw aPDrAHduTr5wsHaWYRSxG5GFCFa+gjmJlwnOn38qf7cRgSCsW6qovxCB2e7t/mgiA3pg gXAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id :disposition-notification-to:date:user-agent:mime-version :in-reply-to; bh=H0PpflmJAvL1J7xN0KN1SL01lAS9oTKcFJbYss8hxfk=; b=MpsuGgQR/b/EPmNvn91ohVeRnqW9VbjMWjQTVSVUpbwUYeo1DExai8/en5+yWIsWvW D+I40LNZNQQJpciZHsTbvCMG68BjEvhjTJu9zVnxOy3d12F96f+io7IZrU/Z9eepZr4W JBsPy3gdlGIHuaWGkxnDgANVTOF4KDicp1aQK6Dj/iPyHfeisEb9a2Jw1SJyZV8+E76C xNNR2YPQWlNuZIsLVnSQmTz275twsRME5pZez2zvAxseIJ8x7UZkJSntJeeuKTRjpTko B3FU0ND3m7UOlRVJnMWMrxS1nmYFvb/IHUAsIVRtRy0h0QzL+BDTNB/WEotzXlcp7ckm 8sNA== X-Gm-Message-State: AODbwcDE5PGMT/sc3j4KO3k+GpT79upv7E+Qso0zBcyTmB4e+SXI7aGE V3a5wMQF6bIGdL5f X-Received: by 10.80.152.9 with SMTP id g9mr24671096edb.10.1495621077075; Wed, 24 May 2017 03:17:57 -0700 (PDT) Received: from [10.0.0.3] ([82.212.185.202]) by smtp.gmail.com with ESMTPSA id i42sm898538ede.5.2017.05.24.03.17.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 May 2017 03:17:56 -0700 (PDT) Subject: Re: Public IPv6s fail on KVM bridge with "No buffer space available" To: Alarig Le Lay Cc: "Andrey V. Elsukov" , freebsd-net@freebsd.org References: <84cecdc7-e331-d3bc-3fb3-e35507e231d6@yandex.ru> <20170522121318.2pzqt5ryisrl44rn@mew.swordarmor.fr> From: William Gathoye Message-ID: <19651499-409c-297f-9d53-fa0eeb9cdd25@gathoye.be> Date: Wed, 24 May 2017 12:17:50 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: <20170522121318.2pzqt5ryisrl44rn@mew.swordarmor.fr> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="LVMlh6f1cfhtNVckMQwvbcVI98JRElvSF" X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 May 2017 10:18:01 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --LVMlh6f1cfhtNVckMQwvbcVI98JRElvSF Content-Type: multipart/mixed; boundary="h5vTiTHo81SiUTNfuupwOJvv374IMVGEJ"; protected-headers="v1" From: William Gathoye To: Alarig Le Lay Cc: "Andrey V. Elsukov" , freebsd-net@freebsd.org Message-ID: <19651499-409c-297f-9d53-fa0eeb9cdd25@gathoye.be> Subject: Re: Public IPv6s fail on KVM bridge with "No buffer space available" References: <84cecdc7-e331-d3bc-3fb3-e35507e231d6@yandex.ru> <20170522121318.2pzqt5ryisrl44rn@mew.swordarmor.fr> In-Reply-To: <20170522121318.2pzqt5ryisrl44rn@mew.swordarmor.fr> --h5vTiTHo81SiUTNfuupwOJvv374IMVGEJ Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 05/22/2017 02:13 PM, Alarig Le Lay wrote: > You can try to ping6 the IPv6 multicast address for all the routers on > the link: >=20 > 14:07 alarig@mew ~ % ping6 -c1 ff02::2%vtnet0 > PING6(56=3D40+8+8 bytes) fe80::a800:ff:fe93:83a3%vtnet0 --> ff02::2%vtn= et0 > 16 bytes from fe80::209%vtnet0, icmp_seq=3D0 hlim=3D64 time=3D0.237 ms >=20 > --- 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 In this use case, you make the assumption that my gateway is actually the first one to respond, this is why you select only the first answer using -c1. But as you can see below, if I remove that argument, several routers are answering to me (seems sensible to me), how can I be sure my gateway is actually the first device that answers? PING6(56=3D40+8+8 bytes) fe80::ff:fec2:e61d%vtnet0 --> ff02::2%vtnet0 16 bytes from fe80::268a:7ff:fe91:e970%vtnet0, icmp_seq=3D0 hlim=3D64 time=3D0.292 ms 16 bytes from fe80::268a:7ff:fe91:ea98%vtnet0, icmp_seq=3D0 hlim=3D64 time=3D0.355 ms(DUP!) 16 bytes from fe80::2ff:ffff:feff:fffd%vtnet0, icmp_seq=3D0 hlim=3D64 time=3D2.970 ms(DUP!) 16 bytes from fe80::2ff:ffff:feff:fffe%vtnet0, icmp_seq=3D0 hlim=3D64 time=3D5.964 ms(DUP!) 16 bytes from fe80::268a:7ff:fe91:e970%vtnet0, icmp_seq=3D1 hlim=3D64 time=3D0.314 ms 16 bytes from fe80::268a:7ff:fe91:ea98%vtnet0, icmp_seq=3D1 hlim=3D64 time=3D0.389 ms(DUP!) 16 bytes from fe80::2ff:ffff:feff:fffd%vtnet0, icmp_seq=3D1 hlim=3D64 time=3D3.222 ms(DUP!) 16 bytes from fe80::2ff:ffff:feff:fffe%vtnet0, icmp_seq=3D1 hlim=3D64 time=3D6.382 ms(DUP!) How can I understand the "DUP!" statement here? I assume these are due because we are using multicast here end the ICMP reply are echoes to each others? Right? >=20 > 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= stuck on > the /56 setup. >=20 As you can see, it seems there is no restriction / too nasty things at OVH, as I have got replies, at least :) Regards, -- William Gathoye --h5vTiTHo81SiUTNfuupwOJvv374IMVGEJ-- --LVMlh6f1cfhtNVckMQwvbcVI98JRElvSF Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE8ucX65+2FhkmJe7RDn3lLATXFoMFAlklXc4ACgkQDn3lLATX FoMUqxAAl9zZM9ErmW2GICvgtJIQrUXTHTuD5LT9fl2Xbw6/Dp0URIYA5w6XBImk LB55e2s5xyTog4qglSq8NYcbx9iQQrNGwWT5qLbBCeZFdhC9vy5gAD6GKrh3kW8U e9qk4xwGBk8bWexTjvUvyfH58/MJrPWQfMUeyw9HBcCdRAh8ItQ3DTKL68tqAhU1 hUm4DHeBNqHDXmUI1+UpIviaKZ1h5ExfliT4GquQhJ0qmZ+FgHw4aZ/qOzbMkt1i GA/UqA01vW3nEXx4vGx5m7Ti7MHU54m9qjTZSV/Tly95ZrgT/sz9JwdjFfO62IOl 7PFFsKjRV0+h4+3BAcJQshAsAsW3oSueqBjgw7Gso5AYyOL+5DvmcHtiDSsZ8Hg6 Xs6nWNXL6pm790aMoKKXW3Ogkbg+SCA2WYZMgsit7gLvChLLDk+GvoJI8ttYmXrb ljNRrM0gNyn0rOfSOJV+0I0zXNRYdoUMg9dpny2jmD9NLaDUN16YaFwPY0Uqo32V Ybq1j+1a5/bRxcFe/Dz3xNxMBwqCOzvKBauQhKivP+8c+7QJ5u4g/C9g6CiUdmmE uZoqeRJKboFkk7x5TkHAO4EcM2p2aCAHr5xa5tspnms+7FeooPPE1EeZCELGQz3d z60eRGyEx0RtyYcQVUhN3LbTXjIOUSzsjdpa3WX1b/lN7Q/qojI= =H5ze -----END PGP SIGNATURE----- --LVMlh6f1cfhtNVckMQwvbcVI98JRElvSF--