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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