On 19 April 2016 at 12:22, Patrick O'Callaghan <pocallaghan@gmail.com> wrote:
On Mon, 2016-04-18 at 12:56 -0700, Samuel Sieb wrote:
> On 04/18/2016 05:19 AM, Patrick O'Callaghan wrote:
> >
> > On Sun, 2016-04-17 at 14:31 +0100, Patrick O'Callaghan wrote:
> > >
> > > I've been occasionally using a Windows 7 VM with the libvirt
> > > system
> > > for
> > > several months now and have had no problems up to now. However
> > > recently
> > > I've been getting error messages from Windows about the network
> > > being
> > > "unknown" and my shared host/guest volume is unavailable. On the
> > > most
> > > recent attempt I see:
> > >
> > > Virtual network 'default': NAT (Inactive)
> > >
> > > as the entry under the Network Source drop-down in Virtual
> > > Machine
> > > Manager's "Show Hardware Details" menu.
> > >
> > > This is most likely PEBKAC but I'd be grateful for a newbie's
> > > guide
> > > to
> > > how this stuff should be set up without straying too far from
> > > defaults.
> > > My goal is pretty simple: a bridged network to get shared folders
> > > with
> > > my Fedora 23 host and Internet client access from the guest.
> > I still have no idea how this happened, but I found the fix here:
> >
> > http://ask.xmodulo.com/network-default-is-not-active.html
> >
> > and it worked.
> >
> Have you tried rebooting since then?  Does it still work?  I don't
> think 
> you should have an ifcfg file for that interface as you don't want 
> NetworkManager interacting with it.  If everything still works after 
> rebooting, then great.  Otherwise, try removing that file.

Good call. It failed again on rebooting. I removed the file and
rebooted again and now it works.

Is one supposed to know this by magic? I can't be the only one who's
had this problem. I read the Release Notes every time I update the
system and can't recall seeing it anywhere.



Note that a standard install has no ifcfg-virbr0 config ... it's handled entirely by libvirt 

Remove that file entirely and let libvirt handle setting up the NAT interface 

If something puts it back then put NM_CONTROLLED=no in the file to prevent NM from using it.