Re: Bug#625914: linux-image-2.6.38-2-amd64: bridging is not interacting well with multicast in 2.6.38-4
On Fri, 2011-05-06 at 13:12 -0700, Noah Meyerhans wrote: > Package: linux-2.6 > Version: 2.6.38-3 > Severity: normal > > 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. > > The bridge configuration is: > bridge name bridge id STP enabled interfaces > br0 8000.0002e3080eb5 no eth1 > tap0 > tap1 > tap2 > > 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. > > 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 188.8.131.52 and 184.108.40.206, but they don't look like they would cause this. Ben. -- Ben Hutchings Once a job is fouled up, anything done to improve it makes it worse.
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