On Thu, Nov 22, 2012 at 03:29:52PM +0100, Peter Lieven wrote: > is anyone aware of a problem with the linux network bridge that in very rare > circumstances stops > a bridge from sending pakets to a tap device? > > My problem occurs in conjunction with vanilla qemu-kvm-1.2.0 and Ubuntu > Kernel 3.2.0-34.53 > which is based on Linux 3.2.33. > > I was not yet able to reproduce the issue, it happens in really rare cases. > The symptom is that > the tap does not have any TX packets. RX is working fine. I see the packets > coming in at > the physical interface on the host, but they are not forwarded to the tap > interface. > The bridge itself has learnt the mac address of the vServer that is connected > to the tap interface. > It does not help to toggle the bridge link status, the tap interface status > or the interface in the vServer. > It seems that problem occurs if a tap interface that has previously been > used, but set to nonpersistent > is set persistent again and then is by chance assigned to the same vServer > (=same mac address on same > bridge) again. Unfortunately it seems not to be reproducible.
Not sure but this patch from Michael Tsirkin may help - it solves an issue with persistent tap devices: http://patchwork.ozlabs.org/patch/198598/ Stefan
