Re: virt-manager and qemu: virtual networking missing
On Sun, Oct 26, 2025 at 9:34 PM David <bouncingcats@gmail.com> wrote:
>
> [...]
> > I have the default network, XML and all, as you describe. What I don't
> > have is the interface virbr0 for the default network to use. What I
> > need to know is how to set the interface virbr0 up.
>
> Maybe you'll find something useful in these detailed instructions for
> nmcli [1][2] or nmtui [3].
>
> I see that [3] says: "Note that a bridge cannot be established
> over Wi-Fi networks operating in Ad-Hoc or Infrastructure modes."
> ... not sure exactly what that means or if it affects your situation.
In practice, that means you have to use the virtual bridge interface
(virbr0) when using Wifi. You cannot use a bridge interface (br0).
And if you want your guest VM to obtain a DHCP address from a DHCP
server on your LAN, then you must use bridge interface (br0). You
cannot use a virtual bridge interface (virbr0).
(Personally, I have never understood the restrictions. I just know
they exist.)
> Lots of moving parts here: distro packaging differences, multiple
> network management schemes, libvirt changes. My network
> competence is very low, I hope I'm not adding too much noise
> to the thread, I'm just here hoping to learn from how you solve it.
>
> [1] https://gist.github.com/plembo/f7abd2d9b6f76e7afdece02dae7e5097
> [2] https://gist.github.com/plembo/a7b69f92953a76ab2d06533754b5e2bb
> [3] https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/networking_guide/ch-configure_network_bridging
Jeff
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