Re: virt-manager and qemu: virtual networking missing

[didier gaumet <didier.gaumet@gmail.com>]

Le 26/10/2025 à 02:11, Charles Curley a écrit :
[...]
> In the past installing virt manager was sufficient; the virtual network
> Just Worked. Not so now.

Hello,

Here (Trixie, Gnome (thus network-manager)) this is still the case: 
bridge-utils is not installed, dnsmasq-base is installed as a dependency 
of network-manager. Just installing virt-manager was sufficient to have 
network in the guests.

Please verify your setup in virt-manager (QEMU/KVM, right click, 
details, virtual networks, XML), you should have something like that:
<network>
  <name>default</name>
  <uuid>849111bd-18c3-4ae2-857b-1a6f2ee88b32</uuid>
  <forward mode="nat">
    <nat>
      <port start="1024" end="65535"/>
    </nat>
  </forward>
  <bridge name="virbr0" stp="on" delay="0"/>
  <mac address="52:54:00:cc:c4:91"/>
  <ip address="192.168.122.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.122.2" end="192.168.122.254"/>
    </dhcp>
  </ip>
</network>

in the "details" tab (instead of the "XML" one) please verify that the 
state is active and that automatic start is checked

My setup was automatically created, if that is not the case, you can 
create it manually