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Dual-stack networking

As explained in Kubernetes in Action, Second Edition

Dual-stack networking provides simultaneous IPv4 and IPv6 connectivity within a network environment.

Dual-stack networking supports both IPv4 and IPv6. In Kubernetes, a Service can receive addresses from both families when the cluster supports dual-stack networking. section 11.1.2

Choose a Service IP-family policy according to the required behavior:

  • SingleStack assigns one IP family, regardless of whether the cluster supports single-stack or dual-stack networking. section 11.1.2
  • PreferDualStack requests both IP families on a dual-stack cluster, but falls back to one family on a single-stack cluster. section 11.1.2
  • RequireDualStack requires a dual-stack cluster; Service creation succeeds only when both IP families are available. section 11.1.2

Inspect assigned families in spec.ipFamilies. For a dual-stack Service, spec.clusterIPs contains both addresses, while spec.clusterIP contains only one; their ordering corresponds. section 11.1.2

How Kubernetes in Action, Second Edition covers it

How deep it goes
Explains three policies and assigned-address fields, but stops short of cluster-level dual-stack configuration.
Examples
Uses Service policies and the spec.ipFamilies, spec.clusterIP, and spec.clusterIPs fields as configuration examples.
What it assumes
Assumes a Kubernetes Service and cluster IP concepts, while defining IPv4 and IPv6 behavior through Service fields.
What you can do after
Configure a Kubernetes Service with SingleStack, PreferDualStack, or RequireDualStack behavior.
How it connects
Connects IPv4, IPv6, Kubernetes Service, clusterIP, clusterIPs, and ipFamilies.
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