Comment 9 for bug 1432599

Description of problem:

Since I upgraded to Fedora 21, NetworkManager is now offering
to manage virbr0. In fact, if I disconnect from wireless,
then it falls back to "helpfully" connecting me to virbr0, which
is of course completely useless.

More seriously, I suspect that NM is actually breaking virbr0.
For some reason, virbr0-nic became disconnected from the virbr0
bridge, and that broke all libvirt networking, and I suspect
this happened about the time that NM decided to connect my
main network to virbr0.

I've no idea what we can do about this, or even which component
this belongs to.

On my machine I tried adding:
NM_CONTROLLED=no
to /etc/sysconfig/network-scripts/ifcfg-virbr0
although this has so far not made any difference (but
I haven't rebooted yet).

Version-Release number of selected component (if applicable):

libvirt-1.2.9-4.fc21.x86_64
NetworkManager-0.9.10.0-13.git20140704.fc21.x86_64

How reproducible:

100%

Steps to Reproduce:
1. Use Fedora 21 and libvirt and NM.