### IPv4/IPv6 run

IPv4/IPv6 dual-stack has been reimplemented for 1.20 to support dual-stack Services, based on user and community feedback. If your cluster has dual-stack enabled, you can create Services which can use IPv4, IPv6, or both, and you can change this setting for existing Services. Details are available in updated [IPv4/IPv6 dual-stack docs](https://docs.k8s.io/concepts/services-networking/dual-stack/), which cover the nuanced array of options.

  # CoreDNS should handle those domains and answer with NXDOMAIN instead of SERVFAIL
  # otherwise pods stops trying to resolve the domain.
  if [ "${IP_FAMILY}" = "ipv6" ] || [ "${IP_FAMILY}" = "dual" ]; then
    # Get the current config
    original_coredns=$(kubectl get -oyaml -n=kube-system configmap/coredns)
    echo "Original CoreDNS config:"
    echo "${original_coredns}"
    # Patch it
    fixed_coredns=$(

      podAnnotations: {}
      type: ClusterIP # change to NodePort or LoadBalancer if need be

      # Setup how istiod Service is configured. See https://kubernetes.io/docs/concepts/services-networking/dual-stack/#services
      ipFamilyPolicy: ""
      ipFamilies: []

      secretVolumes:
      - name: egressgateway-certs
        secretName: istio-egressgateway-certs
        mountPath: /etc/istio/egressgateway-certs

          memory: 1024Mi

      loadBalancerIP: ""
      loadBalancerSourceRanges: []
      serviceAnnotations: {}

      # Setup how istiod Service is configured. See https://kubernetes.io/docs/concepts/services-networking/dual-stack/#services
      ipFamilyPolicy: ""
      ipFamilies: []

      # To generate an internal load balancer:
      # --set serviceAnnotations.cloud.google.com/load-balancer-type=internal
      #serviceAnnotations:

	pod, ns := buildFakePodAndNSForClient()
	pod.ObjectMeta.Annotations[sidecarStatusKey] = "true"
	pod.Spec.Containers = []corev1.Container{
		{
			Name: "istio-proxy",
			Env:  []corev1.EnvVar{{Name: "ISTIO_DUAL_STACK", Value: "true"}},
		}, {Name: "mockContainer"},
	}

	mockIntercept := testDoAddRun(t, buildMockConf(true, ""), testNSName, pod, ns)

	if len(mockIntercept.lastRedirect) == 0 {

    # Additional labels to apply on the pod level for monitoring and logging configuration.
    podLabels: {}
    # Setup how istiod Service is configured. See https://kubernetes.io/docs/concepts/services-networking/dual-stack/#services
    ipFamilyPolicy: ""
    ipFamilies: []
  sidecarInjectorWebhook:
    # You can use the field called alwaysInjectSelector and neverInjectSelector which will always inject the sidecar or

### IPv4/IPv6 Dual-stack Networking graduates to GA

[IPv4/IPv6 dual-stack networking](https://github.com/kubernetes/enhancements/tree/master/keps/sig-network/563-dual-stack) graduates to GA.
Since 1.21, Kubernetes clusters are enabled to support dual-stack networking by default.
In 1.23, the `IPv6DualStack` feature gate is removed.
The use of dual-stack networking is not mandatory.

    # Additional labels to apply on the pod level for monitoring and logging configuration.
    podLabels: {}

    # Setup how istiod Service is configured. See https://kubernetes.io/docs/concepts/services-networking/dual-stack/#services
    ipFamilyPolicy: ""
    ipFamilies: []

  sidecarInjectorWebhook:
    # You can use the field called alwaysInjectSelector and neverInjectSelector which will always inject the sidecar or

- `-- kube-controller-manager`
  `--node-cidr-mask-size-ipv4 int32`     Default: 24. Mask size for IPv4 node-cidr in dual-stack cluster.
`--node-cidr-mask-size-ipv6 int32`     Default: 64. Mask size for IPv6 node-cidr in dual-stack cluster.

    These 2 flags can be used only for dual-stack clusters. For non dual-stack clusters, continue to use  `--node-cidr-mask-size` flag to configure the mask size.

pkg sync/atomic, method (*Value) Load() interface{}
pkg sync/atomic, method (*Value) Store(interface{})
pkg sync/atomic, type Value struct

# CL 126190043 syscall: support UID/GID map files for Linux user namespaces, Mrunal Patel <******@****.***>
pkg syscall (linux-386), type SysProcAttr struct, GidMappings []SysProcIDMap
pkg syscall (linux-386), type SysProcAttr struct, UidMappings []SysProcIDMap
pkg syscall (linux-386), type SysProcIDMap struct