[libvirt-users] Problem with bridged network configuration

[Bob Doolittle]

For the record - I figured this out so am sharing the result for posterity:

The issue was that I didn't follow the instructions literally. Since, 
once booted, my primary NIC name was "em1" I assumed I had to create an 
initscript called ifcfg-em1 rather than ifcfg-eth0 as described in the doc.

Once I renamed that script to ifcfg-eth0 (and changed the DEVICE value 
in the file to match), all is well. It does indeed appear to be a timing 
issue due to the "Predictable Network Interface Names" feature and when 
its NIC name musical chairs dance begins.

I have had more problems due to that one feature than anything else in 
recent memory. It is a misnomer if ever there was one. Even the docs 
related to it are incorrect (for Fedora 19, creating the symlink 
described at 
http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/ 
doesn't have the expected result of disabling the feature).

Thanks,
     Bob

On 11/12/2013 10:17 AM, Bob Doolittle wrote:
> Hi,
>
> When I initially boot my system, it fails to bring up the network.
> Once booted, if I run "systemctl restart network.service", or even 
> stop, wait a while, then start, it starts up fine and all is well.
>
> I'm running Fedora 19 (updated).
>
> I followed the instructions on this page to set up a bridged network:
> http://wiki.libvirt.org/page/Networking
>
> I note however that I did *not* have any bridge (for NAT use) 
> configured initially by default on my system, and followed the 
> directions on this page to create it:
> https://fedoraproject.org/wiki/Getting_started_with_virtualization
>
> I have disabled the NetworkManager service, and created network 
> initscripts for my em1 and br0 interfaces.
>
> I notice from the systemctl status output, that the network failure is 
> logged, and only *after* that the br0 interface comes up. So I wonder 
> if there is some ordering problem in spite of the fact that I have 
> specified DELAY=0 for br0.
>
> I have included output from the following commands:
> systemctl status network.service (initially, when failed to come up)
> brctl show
> ip link
> ip address
>
> Also attached are the network initscripts for my em1 and br0 interfaces.
>
> Any guidance would be much appreciated!
>
> Thanks,
>    Bob
>