To propertly configure ipv6 at VMs from ovn-k we have to configure dhcpv6 stateful (https://www.networkacademy.io/ccna/ipv6/stateful-dhcpv6) with fqdn and override router advertisment src ip address (it will be the default gw) with a new knob at ovn.

Tasks:

• Configure fqdn DHCPv6  options  at  the  logical  switch  port
  • https://man7.org/linux/man-pages/man5/ovn-nb.5.html#DHCP_Options_TABLE
• Add ovn knob to override router advertisment src address
  • Thread https://redhat-internal.slack.com/archives/C01G7T6SYSD/p1689664628680769
  • PoC https://github.com/ovn-org/ovn/pull/205
• Wire up new overriding RA src ip with the new ovn knob and remove ignition 
  • https://github.com/openshift/machine-config-operator/tree/master/templates/common/kubevirt/files