User Story:

The user should be able to define both IPv4 and IPv6 CIDR entries for:

• networking.clusterNetwork
• networking.serviceNetwork
• networking.machineNetwork

Note: For AWS, if the installer provisions the VPC (without using any byo VPC IPv6 CIDR methods), the VPC IPv6 CIDR (machineNetwork) is not known in advance (i.e. only after the VPC is created). This means any validations that expects dual-stack machine CIDR should skip for AWS.

Acceptance Criteria:

Description of criteria:

• IPv4 and IPv6 CIDR can be specified for cluster, service and machine networks.

(optional) Out of Scope:

Detail about what is specifically not being delivered in the story

Engineering Details:

• https://github.com/openshift/installer/blob/dfdec6e1daa25a48f80dd08ae87bd1bed2ad490a/pkg/types/validation/installconfig.go#L347-L422 

This requires/does not require a design proposal.
This requires/does not require a feature gate.