Re: libvirt can't setup simple bridged network?

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Good question. I'm a bit of a libvirt dummy - is there a one-step way?
I created mine in two steps, with nmcli and virsh.

# create the bridge "pubbr0" and plug in interface "enp2s0f0"
nmcli con add ifname pubbr0 type bridge con-name pubbr0
nmcli con add type bridge-slave ifname enp2s0f0 master pubbr0

# write XML file "net-public0.xml" for libvirt's network
  <forward mode="bridge"/>
  <bridge name="pubbr0" />

# create libvirt's network
virsh net-define net-public0.xml
virsh net-start public0

On Mon, Aug 15, 2022 at 3:25 PM Bryan Smith <me@xxxxxxxxxx> wrote:
> Not to tangent (top post), but ...
> This is where I leverage NetworkManager in general (and have a set of standard nmcli commands and Ansible tooling for common scenarios) ... _avoiding_ libvirtd altogether.  I'm even debating about taking away the default 192.168.122/24 NAT subnet as standard in new builds with QEMU/KVM installed, just because of past issues with pre/post routing, or even IP address range conflicts (long story).  It's easy to overlook those as well.
> YMMV, including with oVirt.
> On Mon, Aug 15, 2022 at 10:17 AM Ian Pilcher <arequipeno@xxxxxxxxx> wrote:
>> I feel like I'm taking crazy pills!  I'm reading the libvirt network XML
>> format documentation[1], and I can't figure out how to create a simple
>> bridged network - no NAT, no routing, no OVS, no  macvtap, etc.  I.e.,
>> just a Linux bridge with a single physical interface attached.
>> None of the 3 scenarios listed for <forward mode='bridge'> describe the
>> simple setup that I'm trying to create, so it looks like I'll need to
>> create the bridge separately.  (It's not hard to do, it just seems like
>> such a weird gap the in the functionality.)
>> [1]
> --
> Bryan J Smith  -
> E-mail:  b.j.smith at  or  me at

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