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I'm using KVM virtual machine on Debian 12 and I want to use the default virtual network.
First, the default network was missing

virsh net-list --all

so I reloaded it:

virsh net-define /usr/share/libvirt/networks/default.xml
virsh net-autostart default

virsh net-list --all
 Name      State      Autostart   Persistent
----------------------------------------------
 default   inactive   yes         yes

It worked but it's inactive. Now when I try to start the default network:

virsh net-start default

I get these errors:

error: Failed to start network default
error: internal error: Network is already in use by interface virbr0

How can I fix this ?

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  • Can you update your question to show the output of virsh net-list --all?
    – larsks
    Commented Sep 4 at 18:18
  • @larsks I updated my question.
    – Duddy67
    Commented Sep 5 at 4:35

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