[fedora-virt] Can't use network in guests

Rich Mahn rich at lat.com
Tue Jul 28 15:36:09 UTC 2009

> On Tue, Jul 28, 2009 at 4:13 PM, Mark McLoughlin<markmc at redhat.com> wrote:
> >>    <interface type='bridge'>
> >>      <mac address='54:52:00:49:73:9a'/>
> >>      <source bridge='br0'/>
> >>      <target dev='vnet%d'/>
> >
> > Try deleting this line

> I tried removing the line with virsh edit, but restarting the VM with
> virsh start leads to the same error. I double checked and the line
> appeared again, I've no idea how it got there again...

I've just gone through similar situations and now have everything
working like I want.  One of many problems I had was the one above
(and I'm not sure which thing I did fixed it.)
So here's some ideas:

1. Make sure you aren't using NetworkManager.  It seems to do unexpected
   things automatically, and according to
   is doesn't support bridging as of F9.  The instructions at that URL
   pretty much gave me everything I needed to get things going.

2. When I set my interface as you have (mac address and soruce bridge only)
   it adds a target dev=vnet0 automatically.  And this works.

3. You might need to update some packages.  On the client I was unable
   to make NIS work until I updated the ypbind package.

Good luck.


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