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Re: [Qemu-devel] tap devices not receiving packets from a bridge
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] tap devices not receiving packets from a bridge |
Date: |
Fri, 23 Nov 2012 08:02:11 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
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