Acceptance criteria: 

with a install-config.yaml of the ipv6 only form: 

networking:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  - cidr: <ipv6>
    hostPrefix: 23
  machineNetwork:
  - cidr: 10.127.0.0/24
  - cidr: fd00::/8
  networkType: OpenShiftSDN
  serviceNetwork:
  - 172.30.0.0/16
  - <ipv6> 

The command: "openshift-install create cluster " should deploy a cluster which uses ipv6 only as the machineNetwork. 

 Details of deployment: 

OCP is deployed on an an RHEL OSP cluster

The following addresses/subnets will use dual stack ipv6

• machineNetwork

The following ip addresses will be reachable using both ipv4 and ipv6

• Ingreess VIP
• API VIP

NetworkType: OVN-Kubernetes