Hi: Currently we encounter a problem where OpenStack may forget or misconfig the bridge hairpin setting, and will cause some unexpected behavior [1]. Although this bug is marked fixed, but if we manually restart the vm by virsh will also trigger the problem. And because the bridge interface is created and managed by libvirt, we are considering move the hairpin configuration to libvirt. Now I start writing a patch to achieve this, but after digging into the source code, I found only kvm/qemu and uml backend may support this parameter. Other backends manage their own bridge, and seems no way to modify it. I expect is there any solution working in progress or should we add the new hairpin parameter in libvirt configuration ? [1] https://bugs.launchpad.net/nova/+bug/933640