Error: Virbr0 missing, install libvirt

[shom_ronnie]

I am trying to use VMs on my GNS3, for which i need NAT. For the setup to work i need virbr0 to be active, but for some reason, it just wont start. I have reinstalled libvirts, still no use. I need the virbr0 to show up in ifconfig. Please help. Thanks

[catweazel]

I am trying to use VMs on my GNS3, for which i need NAT. For the setup to work i need virbr0 to be active, but for some reason, it just wont start. I have reinstalled libvirts, still no use. I need the virbr0 to show up in ifconfig. Please help. Thanks

https://www.gns3.com/community/latest

Not to put you off, but you do stand a better chance of resolving the problem by asking there.

Cheers.

[shom_ronnie]

I am very well aware of the support page of GNS3, but the problem isnt in GNS, its here in the OS. Mint wont let me create a virtual network, which is the problem, here the required one is virbr0, which is the default one. If i try to create any other virtual network, it gives me the same error

Error creating virtual network: internal error: Failed to initialize a valid firewall backend

Pls help.

[[Lucas]]

I had the same problem. Installing firewalld was the solution for me. Apparently it's a dependency libvirt needs.

So:
sudo apt install firewalld
sudo systemctl start firewalld
sudo systemctl enable firewalld
sudo systemctl restart libvirtd

Then check ifconfig to confirm that virbr0 is listed.

Hope this helps.

[shom_ronnie]

Tried all that, but nothing helped, so reinstalled mint. Thankfully everything is working now, just done with all the setups. Thank you anyways

[jamesG14]

I had the same problem. Installing firewalld was the solution for me. Apparently it's a dependency libvirt needs.

So:
sudo apt install firewalld
sudo systemctl start firewalld
sudo systemctl enable firewalld
sudo systemctl restart libvirtd

Then check ifconfig to confirm that virbr0 is listed.

Hope this helps.

This method resolved that same issue with my GNS3 . But I was wondering what's the connection of virbr0 to the firewalld ?