Description of problem: [ipv6] - Engine receives ipv6 address from dhcp while wasn't requesting and vdsm recognize it as a change while rebooting the server. supervdsm.log --> restore-net::INFO::2016-01-31 12:19:10,330::vdsm-restore-net-config::265::root::(_find_changed_or_missing) ovirtmgmt is different or missing from persistent configuration. current: {'nic': 'enp4s0f0', 'dhcpv6': Fa lse, 'mtu': '1500', 'bootproto': 'dhcp', 'stp': False, 'bridged': True, 'ipv6addr': ['2620:52:0:23a0:29c:2ff:feb0:9f28/64'], 'ipv6gateway': 'fe80:52:0:23a0::1ffe', 'defaultRoute': True}, persisted: {u'nic': u'enp4 s0f0', 'dhcpv6': False, u'mtu': '1500', u'bootproto': u'dhcp', 'stp': False, u'bridged': True, u'defaultRoute': True} Version-Release number of selected component (if applicable): 3.6.3-0.1.el6 vdsm-4.17.19-0.el7ev.noarch
The severity is actually quite high, as it can cause hosts to loose connectivity after reboot http://lists.ovirt.org/pipermail/users/2016-February/038132.html
Verified on - 3.6.4-0.1.el6 and vdsm-4.17.23.1-0.el7ev.noarch