Ccontrollers looses their ipv6 ip address after reboot/network restart because of net.ipv6.conf.default.disable_ipv6=1. Should be 0. The value of net.ipv6.conf.default.disable_ipv6 in/etc/sysctl.conf file should be 0. /var/log/messages Feb 21 15:18:57 overcloud-controller-2 systemd: Started Open vSwitch Internal Unit. Feb 21 15:18:57 overcloud-controller-2 polkitd[1188]: Started polkitd version 0.112 Feb 21 15:18:58 overcloud-controller-2 dbus[1027]: [system] Successfully activated service 'org.freedesktop.PolicyKit1' Feb 21 15:18:58 overcloud-controller-2 systemd: Started Authorization Manager. Feb 21 15:18:58 overcloud-controller-2 dbus-daemon: dbus[1027]: [system] Successfully activated service 'org.freedesktop.PolicyKit1' Feb 21 15:18:58 overcloud-controller-2 systemd: Started PCS GUI and remote configuration interface. Feb 21 15:19:01 overcloud-controller-2 systemd: Started Initial cloud-init job (pre-networking). Feb 21 15:19:03 overcloud-controller-2 NetworkManager[1079]: <info> startup complete Feb 21 15:19:03 overcloud-controller-2 systemd: Started Network Manager Wait Online. Feb 21 15:19:03 overcloud-controller-2 systemd: Starting LSB: Bring up/down networking... Feb 21 15:19:03 overcloud-controller-2 network: Bringing up loopback interface: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo' Feb 21 15:19:03 overcloud-controller-2 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo' Feb 21 15:19:03 overcloud-controller-2 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo' Feb 21 15:19:03 overcloud-controller-2 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo' Feb 21 15:19:03 overcloud-controller-2 network: [ OK ] Feb 21 15:19:03 overcloud-controller-2 ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl -t 10 -- --may-exist add-br br-ex -- set bridge br-ex other-config:hwaddr=a0:36:9f:22:e6:f6 Feb 21 15:19:03 overcloud-controller-2 NetworkManager[1079]: <info> (br-ex): link connected Feb 21 15:19:04 overcloud-controller-2 network: Bringing up interface br-ex: [ OK ] Feb 21 15:19:04 overcloud-controller-2 kernel: IPv6: ADDRCONF(NETDEV_UP): em1: link is not ready Feb 21 15:19:06 overcloud-controller-2 network: Bringing up interface em1: [ OK ] Feb 21 15:19:07 overcloud-controller-2 kernel: ixgbe 0000:03:00.0: registered PHC device on em3 Feb 21 15:19:07 overcloud-controller-2 kernel: IPv6: ADDRCONF(NETDEV_UP): em3: link is not ready Feb 21 15:19:07 overcloud-controller-2 kernel: ixgbe 0000:03:00.0 em3: detected SFP+: 3 Feb 21 15:19:07 overcloud-controller-2 kernel: igb 0000:02:00.0 em1: igb: em1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX Feb 21 15:19:07 overcloud-controller-2 kernel: IPv6: ADDRCONF(NETDEV_CHANGE): em1: link becomes ready Feb 21 15:19:07 overcloud-controller-2 NetworkManager[1079]: <info> (em1): link connected Feb 21 15:19:07 overcloud-controller-2 kernel: ixgbe 0000:03:00.0 em3: NIC Link is Up 10 Gbps, Flow Control: RX/TX Feb 21 15:19:07 overcloud-controller-2 kernel: IPv6: ADDRCONF(NETDEV_CHANGE): em3: link becomes ready Feb 21 15:19:07 overcloud-controller-2 NetworkManager[1079]: <info> (em3): link connected Feb 21 15:19:07 overcloud-controller-2 network: Bringing up interface em3: [ OK ] Feb 21 15:19:07 overcloud-controller-2 kernel: ixgbe 0000:03:00.1: registered PHC device on em4 Feb 21 15:19:07 overcloud-controller-2 kernel: IPv6: ADDRCONF(NETDEV_UP): em4: link is not ready Feb 21 15:19:07 overcloud-controller-2 NetworkManager[1079]: <info> (em4): enslaved to non-master-type device ovs-system; ignoring Feb 21 15:19:07 overcloud-controller-2 kernel: ixgbe 0000:03:00.1 em4: detected SFP+: 4 Feb 21 15:19:08 overcloud-controller-2 kernel: ixgbe 0000:03:00.1 em4: NIC Link is Up 10 Gbps, Flow Control: RX/TX Feb 21 15:19:08 overcloud-controller-2 kernel: IPv6: ADDRCONF(NETDEV_CHANGE): em4: link becomes ready Feb 21 15:19:08 overcloud-controller-2 NetworkManager[1079]: <info> (em4): enslaved to non-master-type device ovs-system; ignoring Feb 21 15:19:08 overcloud-controller-2 NetworkManager[1079]: <info> (em4): link connected Feb 21 15:19:08 overcloud-controller-2 ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl -t 10 -- --if-exists del-port br-ex em4 -- add-port br-ex em4 Feb 21 15:19:08 overcloud-controller-2 network: Bringing up interface em4: [ OK ] Feb 21 15:19:08 overcloud-controller-2 ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl -t 10 -- --may-exist add-port br-ex vlan184 tag=184 -- set Interface vlan184 type=internal Feb 21 15:19:08 overcloud-controller-2 NetworkManager[1079]: <info> (vlan184): link connected Feb 21 15:19:08 overcloud-controller-2 network: Bringing up interface vlan184: RTNETLINK answers: Permission denied Feb 21 15:19:08 overcloud-controller-2 network: [ OK ] Feb 21 15:19:08 overcloud-controller-2 ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl -t 10 -- --may-exist add-port br-ex vlan188 tag=188 -- set Interface vlan188 type=internal Feb 21 15:19:08 overcloud-controller-2 NetworkManager[1079]: <info> (vlan188): link connected Feb 21 15:19:09 overcloud-controller-2 network: Bringing up interface vlan188: RTNETLINK answers: Permission denied Feb 21 15:19:09 overcloud-controller-2 network: RTNETLINK answers: No route to host Feb 21 15:19:09 overcloud-controller-2 network: [ OK ] Feb 21 15:19:09 overcloud-controller-2 systemd: Started LSB: Bring up/down networking. Feb 21 15:19:09 overcloud-controller-2 systemd: Reached target Network. Feb 21 15:19:09 overcloud-controller-2 systemd: Starting Network. Feb 21 15:19:09 overcloud-controller-2 systemd: Starting Simple Network Management Protocol (SNMP) Daemon.... Feb 21 15:19:09 overcloud-controller-2 systemd: Starting DHCP interface br/int... Feb 21 15:19:09 overcloud-controller-2 systemd: Starting DHCP interface em2... Feb 21 15:19:09 overcloud-controller-2 systemd: Starting DHCP interface ovs/system... Feb 21 15:19:09 overcloud-controller-2 systemd: Started DHCP interface lo.
*** This bug has been marked as a duplicate of bug 1309483 ***