Date: Wed, 24 May 2017 12:17:50 +0200 From: William Gathoye <william@gathoye.be> To: Alarig Le Lay <alarig@swordarmor.fr> 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: <19651499-409c-297f-9d53-fa0eeb9cdd25@gathoye.be> In-Reply-To: <20170522121318.2pzqt5ryisrl44rn@mew.swordarmor.fr> References: <fbfe1ff2-bd66-9a98-d56b-6d75265936bd@gathoye.be> <84cecdc7-e331-d3bc-3fb3-e35507e231d6@yandex.ru> <a44fa8c5-d48f-25eb-51d2-16d100ba5f53@gathoye.be> <20170522121318.2pzqt5ryisrl44rn@mew.swordarmor.fr>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --LVMlh6f1cfhtNVckMQwvbcVI98JRElvSF Content-Type: multipart/mixed; boundary="h5vTiTHo81SiUTNfuupwOJvv374IMVGEJ"; protected-headers="v1" From: William Gathoye <william@gathoye.be> To: Alarig Le Lay <alarig@swordarmor.fr> Cc: "Andrey V. Elsukov" <bu7cher@yandex.ru>, 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: <fbfe1ff2-bd66-9a98-d56b-6d75265936bd@gathoye.be> <84cecdc7-e331-d3bc-3fb3-e35507e231d6@yandex.ru> <a44fa8c5-d48f-25eb-51d2-16d100ba5f53@gathoye.be> <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 <william@gathoye.be> --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--
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