Re: Problem with bridged tap interface

["Daniel P. Berrange" <berrange@redhat.com>]

On Wed, Feb 23, 2011 at 12:34:45PM +0100, andreas.ames@de.transport.bombardier.com wrote:
> Hi all,
> 
> sorry for the previous partial e-mail, I hit the send button accidentally 
> ;-).
> 
> I have a setup with a kvm-based virtual machine running a stock RedHat 6.1 
> (yes, that old) on a rather current debian host.
> 
> 1. uname in host: 2.6.26-2-amd64 #1 SMP Wed May 12 18:03:14 UTC 2010 
> x86_64 GNU/Linux
> 
> 2. uname in guest: 2.2.12-20 #1 Mon Sep 27 10:40:35 EDT 1999 i686 unknown
> 
> eth0 of the guest is connected via tap0 to a kernel bridge, that is in 
> turn connected via the host's eth1 to a Gigabit link.  On the kvm 
> command-line I configure the guest-nic as "model=ne2k_pci".
> 
> The problem is, that I frequently loose network access from/to the guest.

There have been QEMU NIC model implementation bugs that exhibit
that characteristic. If you have the drivers available in the
guest, then I'd recommend trying out different NIC models than
ne2k, since that's probably the least actively maintained NIC
model. At least try rtl8139, but ideally the e1000 too.

Regards,
Daniel
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