Support Dual-Stack in Hosted Control Planes

Goal

Support Dual-Stack Networking (IPv4 & IPv6) for hosted control planes. 

Why is this important?

Many of our customer,especially Telco providers have a need to support IPv6 but can't do so immediately, they would still have legacy IPv4 workload. To support both stacks, an OpenShift cluster must be capable of allowing communication for both flavors. I.e., a OpenShift cluster running with hosted control planes should be able to allow workloads to access both IP stacks.

Scenarios

As a cluster operator, you have the option to expose external endpoints using one or both address families, in any order that suits your needs. OpenShift does not make any assumptions about the network it operates on. For instance, if you have a small IPv4 address space, you can enable dual-stack on some of your cluster nodes and have the rest running on IPv6, which typically has a more extensive address space available.

Acceptance Criteria

• Dev - Has a valid enhancement if necessary
• CI - MUST be running successfully with tests automated
• QE - covered in Polarion test plan and tests implemented
• Release Technical Enablement - Must have TE slides
• ...

Dependencies (internal and external)

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Previous Work (Optional):

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Open questions:

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Done Checklist

• CI - CI is running, tests are automated and merged.
• Release Technical Enablement <link to Feature Enablement Presentation>
• DEV - Upstream documentation merged: <link to meaningful PR or GitHub Issue>
• DEV - Enhancement merged: <link to meaningful PR or GitHub Issue>
• QE - Test plans in Polarion: <link or reference to Polarion>
• QE - Automated tests merged: <link or reference to automated tests>
• DOC - Downstream documentation merged: <link to meaningful PR>