[Bug 746497] Re: libvirt installs firewall rules on package upgrades

[Serge Hallyn]

Looking at http://libvirt.org/formatnetwork.html#examplesRoute, I
suspect this is viewed as a feature, since, if you did have some
existing firewall rules, this would punch the needed holes through that
to let the VMs work as expected.  Agreed it wouldn't hurt to make that
more configurable.  However that would require a patch to be developed
upstream.

You should be able to work around this by editing /etc/init/libvirt-
bin.conf, and adding

post-start exec iptables -F

** Changed in: libvirt (Ubuntu)
       Status: Incomplete => Triaged

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https://bugs.launchpad.net/bugs/746497

Title:
  libvirt installs firewall rules on package upgrades