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Re: kern/46199: 6.0_BETA. "qemu -net tap" + bridge(4). Network problems in guests.

On Thu, Mar 15, 2012 at 12:55:02PM +0000, Aleksey Cheusov wrote:
>  I'm not sure I understood your question. But Opkts sremains the same,
>  a number of drops increased significantly, Ipkts increased a little bit.
>  tap3  1500  <Link>        f2:0b:a4:c7:dd:00     1124     0    28722
>   0     0 201213
>  tap3  1500  fe80::/64     fe80::f00b:a4ff:f     1124     0    28722
>   0     0 201213

OK, so this means packets sent to the VM makes it up to the tap interface,
but nothing consumes them. The VM also sends packets, that are properly
The bug could be in tap(4), or in qemu not reading from the tap(4) descriptor
to get available packets (maybe ktrace could give more details here ?).
The problem doesn't seem to be at the bridge level.

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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