[libvirt] Re: Overriding vnetN with the <target> element in xml configuration not working

Daniel P. Berrange berrange at redhat.com
Mon Sep 29 09:30:16 UTC 2008

On Sat, Sep 27, 2008 at 02:58:14AM +0200, Ahmed Medhat wrote:
> Ok, so its kinda creepy now, it works with change the device name to
> anything but vnetN.

vnetNNN is an automatically generated device name pattern. We explicitly
ignore any requested target dev with that naming pattern because manually
specified name will almost certainly clash with an auto-generated one and
cause the domain to fail to start.

The same applies for 'vifNNNN' naming

> This is what did work with me..
>     <interface type='bridge'>
>       <source bridge='virbr0'/>
>       <target dev="vn01"/>
>       <mac address='00:16:3e:6c:1f:9d'/>
>     </interface>
> This must be something with libvirtd code handling this specific
> element directive.
> I will wait for someone to do any input for a while then fire up a bug report.

It isn't a bug - it is delibrate.

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