From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: Re: Bug#625914: linux-image-2.6.38-2-amd64: bridging is not interacting well with multicast in 2.6.38-4 Date: Tue, 10 May 2011 03:38:44 +0100 Message-ID: <1304995124.4065.157.camel@localhost> References: <20110506201234.6297.70279.reportbug@ip6-localhost> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-/rrDfiKxZGFWPYp3hc+z" Cc: 625914@bugs.debian.org, netdev , bridge@lists.linux-foundation.org To: Noah Meyerhans Return-path: Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:54786 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751775Ab1EJCiw (ORCPT ); Mon, 9 May 2011 22:38:52 -0400 In-Reply-To: <20110506201234.6297.70279.reportbug@ip6-localhost> Sender: netdev-owner@vger.kernel.org List-ID: --=-/rrDfiKxZGFWPYp3hc+z Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2011-05-06 at 13:12 -0700, Noah Meyerhans wrote: > Package: linux-2.6 > Version: 2.6.38-3 > Severity: normal >=20 > Hi. I've got a system that hosts several kvm virtual hosts. The VMs > access the network via tap devices bridged with a physical interface. > After upgrading to linux-image-2.6.38-2-amd64_2.6.38-4, I noticed that > the virtualhosts were not autoconfiguring their IPv6 interfaces. > Debugging revealed that no multicast was passing over the bridge. >=20 > The bridge configuration is: > bridge name bridge id STP enabled interfaces > br0 8000.0002e3080eb5 no eth1 > tap0 > tap1 > tap2 >=20 > If I attach tcpdump to br0, I can see multicast (e.g. IPv6 Neighbor > Solicitation) packets. However, if I attach tcpdump to eth1, I do not > see multicast packets sourced from one of the VMs. >=20 > Downgrading to 2.6.38-3 solves the problem. This is pretty weird. Debian version 2.6.38-3 has a few bridging changes from stable 2.6.38.3 and 2.6.38.4, but they don't look like they would cause this. Ben. --=20 Ben Hutchings Once a job is fouled up, anything done to improve it makes it worse. --=-/rrDfiKxZGFWPYp3hc+z Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIVAwUATcilL+e/yOyVhhEJAQrBVQ//QiTMJ9EtgYvtkUtRZDbwcTKNeHBkTmbo 3QDk3ENxcOCHFaibGEF9H2lc8r4Qn0fRhCGhtysTFHA6JFstDrB848N16rgCyjon PQ5S64I28nMlZfyV/mnd3Hps683/eH0naJlOlunKhZq8cXpZmN+55A9Jq3Fcccbm fVvZR9BQ3l+dIv9P/eEVd5mloPX3TRqI5dDHVTshEc7Lp89LiIQhqwpBIfPtuqiI pwn4dhphtpuP3HvbjdlK3dfLnrfa9ce3UIzFzI5QnZLedmvFNd0+yIciDXtsfua5 sz4WcVgAw0/cuVr+v+mguBbKxuaOkUOfdG8bP5NKblU9rUT28riBcoq8xcPvF2+0 zrI2O64rh7WQKzvhAgrhBXC49abcvnbPliXef7MHp88dCulgR+4mYZcripw32Sa4 l9g9FOrwRQKh0j83rkSovC/akCvzD5K/anA4N7McKR0jAhmbsYEDQQDvt023ldU2 PKbVy0Wn0O7SRx5ivssy2TuVGoPefKXbFnazES4JIAd4fblTq2lVn4Q1e5qQCfNC ySgdwplXqWfAh0CKK+zYkaA2OcIFsUHo3uJ0FmfhxCf6lWzyaKdEV6uOYM+K6E6W QO/PQ/+homuZN6Xla6fqvgevnWkvLCgI0FMT9TlDnFQc9qXJo2iajVKEX1r7jWgz sipS362zHQo= =px4a -----END PGP SIGNATURE----- --=-/rrDfiKxZGFWPYp3hc+z--