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Co-authored-by: Nate W. <[email protected]>
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bridgetkromhout and nate-double-u authored Dec 2, 2021
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Expand Up @@ -33,18 +33,18 @@ Kubernetes 1.23 removed that feature flag as part of graduating the feature to s

While Services are set according to what you configure, Pods default to whatever the CNI plugin sets. If your CNI plugin assigns single-stack IPs, you will have single-stack unless `ipFamilyPolicy` specifies PreferDualStack or RequireDualStack. If your CNI plugin assigns dual-stack IPs, `pod.status.PodIPs` defaults to dual-stack.

Even though dual-stack is possible, it is not mandatory to use it. Examples in the documentation show the variety possible in [dual-stack service configuration](/docs/concepts/services-networking/dual-stack/#dual-stack-service-configuration-scenarios).
Even though dual-stack is possible, it is not mandatory to use it. Examples in the documentation show the variety possible in [dual-stack service configurations](/docs/concepts/services-networking/dual-stack/#dual-stack-service-configuration-scenarios).


## Try dual-stack right now

While upstream Kubernetes now supports [dual-stack networking](/docs/concepts/services-networking/dual-stack/) as a GA or stable feature, each provider’s support of dual-stack Kubernetes may vary. Nodes need to be provisioned with routable IPv4/IPv6 network interfaces. Pods need to be dual-stack. The [network plugin](/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/) is what assigns the IP addresses to the Pods, so the network plugin being used for the cluster needs to support dual-stack. Some Container Network Interface (CNI) plugins support dual-stack, as does kubenet.
While upstream Kubernetes now supports [dual-stack networking](/docs/concepts/services-networking/dual-stack/) as a GA or stable feature, each provider’s support of dual-stack Kubernetes may vary. Nodes need to be provisioned with routable IPv4/IPv6 network interfaces. Pods need to be dual-stack. The [network plugin](/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/) is what assigns the IP addresses to the Pods, so it's the network plugin being used for the cluster that needs to support dual-stack. Some Container Network Interface (CNI) plugins support dual-stack, as does kubenet.

Ecosystem support of dual-stack is increasing; you can create [dual-stack clusters with kubeadm](/docs/setup/production-environment/tools/kubeadm/dual-stack-support/), try a [dual-stack cluster locally with KIND](https://kind.sigs.k8s.io/docs/user/configuration/#ip-family), and deploy dual-stack clusters in cloud providers (after checking docs for CNI or kubenet availability).

## Get involved with SIG Network

SIG-Network wants to learn from community experiences with dual-stack networking, with a goal of finding out more about evolving needs and your use cases. The [SIG-network update video from KubeCon NA 2021](https://www.youtube.com/watch?v=uZ0WLxpmBbY&list=PLj6h78yzYM2Nd1U4RMhv7v88fdiFqeYAP&index=4) summarizes the SIG’s recent updates, including dual-stack going to stable in 1.23.
SIG-Network wants to learn from community experiences with dual-stack networking to find out more about evolving needs and your use cases. The [SIG-network update video from KubeCon NA 2021](https://www.youtube.com/watch?v=uZ0WLxpmBbY&list=PLj6h78yzYM2Nd1U4RMhv7v88fdiFqeYAP&index=4) summarizes the SIG’s recent updates, including dual-stack going to stable in 1.23.

The current SIG-Network [KEPs](https://github.com/orgs/kubernetes/projects/10) and [issues](https://github.com/kubernetes/kubernetes/issues?q=is%3Aopen+is%3Aissue+label%3Asig%2Fnetwork) on GitHub illustrate the SIG’s areas of emphasis. The [dual-stack API server](https://github.com/kubernetes/enhancements/issues/2438) is one place to consider contributing.

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