RHEV: VM lost IPv6 connectivity after upgrading hypervisor to RHEV-H7

Solution Verified - Updated -

Issue

  • IPv6 does not work after upgrading from RHEV-H6 to RHEV-H7.
  • Network connection fails in the VMs.
  • Going back to RHEV-H6 makes IPv6 work again.
  • Can only ping localhost (::1), ping to local IP-address and all other IPs doesn't work.
  • IPv4 is disabled, only IPv6 is used in the VMs.
  • IPv4 connection between RHEV-M and RHEV-H works.
  • IPv6 DAD Fails.
  • In a VM with no IPv6 communication, tentative dadfailed can be seen after the addresses when executing the ip -6 addr show command, as shown below:
#ip -6 addr show
inet6 ADDRESS/MASK scope global tentative dadfailed
inet6 LL-ADDRESS/64 scope link tentative dadfailed

Environment

  • RHEVM 3.5.3
  • RHEVH 6.6 (also 6.5 and 6.4)
    • kernel-2.6.32-504.23.4.el6
    • ovirt-node-3.2.3-3.el6
    • libvirt-0.10.2-46.el6_6.6
    • qemu-kvm-rhev-0.12.1.2-2.448.el6_6.3
  • RHEVH 7.1
    • kernel-3.10.0-229.4.2.el7
    • ovirt-node-3.2.3-3.el7
    • libvirt-1.2.8-16.el7_1.3
    • qemu-kvm-rhev-2.1.2-23.el7_1.3

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