libvirt does not see a firewall backend

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Hi,

 

I am working with libvirt on a small buildroot image and can’t get a network to start:

 

$ virsh net-list –all

Default inactive yes yes

 

$ virsh –debug=4 net-start default

Error: Failed to start network default

Error: internal error: Failed to initialize a vlid firewall backend

 

Reading the source in libvirt-3.7.0/src/util/virfirewall.c, I believe libvirt is checking for iptables, ip6tables, and ebtables, all of which I have installed on the system in the proper directories (according to the *_PATH macros used by libvirt code).

 

 

By removing network configuration from my domain configuration, I can start a VM just fine and see it running with virsh. But it will not start if the network is configured. What do I need to do to fix the “firewall backend” configuration so that libvirt recognizes and accepts my host configurations (iptables / ebtables)? They are installed from standard packages included with buildroot.

 

Thank you.

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