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Re: kern/46199: 6.0_BETA. "qemu -net tap" + bridge(4). Network problems in guests.
The following reply was made to PR kern/46199; it has been noted by GNATS.
From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Cc: kern-bug-people%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost,
Subject: Re: kern/46199: 6.0_BETA. "qemu -net tap" + bridge(4). Network
problems in guests.
Date: Thu, 15 Mar 2012 15:59:15 +0100
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 <bouyer%antioche.eu.org@localhost>
NetBSD: 26 ans d'experience feront toujours la difference
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