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tinitus

Member

Registered: 2024-02-20

Posts: 15

Error Creating Bridge Interface in VirtManager

Hello,

I encountered an issue when trying to create a network via VirtManager. The following error message appears:

error creating bridge interface virbr1: Operation not permitted

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 67, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
    ~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/virt-manager/virtManager/createnet.py", line 427, in _async_net_create
    netobj.create()
    ~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/libvirt.py", line 3618, in create
    raise libvirtError('virNetworkCreate() failed')
libvirt.libvirtError: error creating bridge interface virbr1: Operation not permitted

Could anyone advise on where I should begin troubleshooting to resolve this issue?

Thank you!

jonno2002

Member

Registered: 2016-11-21

Posts: 835

Re: Error Creating Bridge Interface in VirtManager

have you followed the wiki ? particularly here and  here

ReDress

Member

From: Nairobi

Registered: 2024-11-30

Posts: 192

Re: Error Creating Bridge Interface in VirtManager

have you followed the wiki ? particularly here and  here

I would much rather create the bridge manually

Koatao

Member

Registered: 2018-08-30

Posts: 103

Re: Error Creating Bridge Interface in VirtManager

I would much rather create the bridge manually

So you have to create the bridge and configure it:

ip link add <bridge_name> type bridge
ip addr add <ip/cidr> dev <bridge_name>
ip link set <bridge_name> up

Then set up the firewall on your host depending on what you want to achieve.
Then you might want to run a DHCP server (and maybe a DNS server).
Finally, attach the VM to the bridge

virt-install -n <domain> --network bridge=<bridge_name>

All of this is not persistent.

Or using Polkit as suggested, you can use virsh to configure and start a network and attach the VM to it.
And this can be made persistent with Libvirt.

Last edited by Koatao (2025-12-13 02:36:13)