Thanks for reporting this bug. I tried to reproduce it using up and down vlans (defined in /etc/network/interfaces), but wasn't able to reproduce it. I didn't try with ipv6 though.
You're running the experimental libnetcf with jessie. Could you tell us which libvirt version you are running? What does 'sudo ncftool list' show? Are your vlans defined in /etc/network/interfaces or did you define them some other way? I wonder whether it could be related to https://bugzilla.redhat.com/show_bug.cgi?id=1185850 -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]

