- Disabled
                type: string
              wireguardEnabled:
                description: 'WireguardEnabled controls whether Wireguard is enabled
                  for IPv4 (encapsulating IPv4 traffic over an IPv4 underlay network).
                  [Default: false]'
                type: boolean
              wireguardEnabledV6:

		families: []api.IPFamily{api.IPv4Protocol},
		svc: svctest.MakeService("foo",
			svctest.SetIPFamilies(api.IPv4Protocol),
			svctest.SetClusterIPs("2000::1")),
		expect: []string{"expected an IPv4 value as indicated"},
	}, {
		name:     "too_many_IPs_singlestack",
		families: []api.IPFamily{api.IPv4Protocol},
		svc: svctest.MakeService("foo",
			svctest.SetClusterIPs("10.0.0.1", "10.0.0.2")),

- File content check for IPV4 is now enabled by default, and the check of IPV4 or IPV6 is done for `kubeadm init` or `kubeadm join` only in case the user intends to create a cluster to support that kind of IP address family ([#115420](https://github.com/kubernetes/kubernetes/pull/115420), [@chendave](...

- `kubelet` allows pods to use the `net.ipv4.tcp_fin_timeout`, “net.ipv4.tcp_keepalive_intvl”
  and “net.ipv4.tcp_keepalive_probes“ sysctl by default; Pod Security Admission
  allows this sysctl in `v1.29+` versions of the baseline and restricted policies. ([#121240](https://github.com/kubernetes/kubernetes/pull/121240), [@HirazawaUi](https://github.com/HirazawaUi))
- `kubelet` now allows pods to use the `net.ipv4.tcp_keepalive_time` sysctl by default

	// Valid list items are "IPv4", "IPv6".
	// More info: https://kubernetes.io/docs/concepts/services-networking/dual-stack/#services
	IpFamilies []string `protobuf:"bytes,29,rep,name=ipFamilies,proto3" json:"ipFamilies,omitempty"`
	// Controls whether Services are configured to use IPv4, IPv6, or both. Valid options
	// are PreferDualStack, RequireDualStack, and SingleStack.

		// an anti-martian-packet rule
		expectFirewall bool
	}{
		{
			name: "ipv4, localhost-nodeports enabled",

			family:             v1.IPv4Protocol,
			localhostNodePorts: true,
			nodePortAddresses:  nil,

			allowAltNodeIP: true,
			expectFirewall: true,
		},
		{
			name: "ipv4, localhost-nodeports disabled",

			family:             v1.IPv4Protocol,

  // podCIDRs represents the IP ranges assigned to the node for usage by Pods on that node. If this
  // field is specified, the 0th entry must match the podCIDR field. It may contain at most 1 value for
  // each of IPv4 and IPv6.
  // +optional
  // +patchStrategy=merge
  repeated string podCIDRs = 7;

  // ID of the node assigned by the cloud provider in the format: <ProviderName>://<ProviderSpecificNodeID>
  // +optional

	// +optional
	Ports []PortStatus
}

// IPFamily represents the IP Family (IPv4 or IPv6). This type is used
// to express the family of an IP expressed by a type (e.g. service.spec.ipFamilies).
type IPFamily string

const (
	// IPv4Protocol indicates that this IP is IPv4 protocol
	IPv4Protocol IPFamily = "IPv4"
	// IPv6Protocol indicates that this IP is IPv6 protocol
	IPv6Protocol IPFamily = "IPv6"
)

}

// IPFamily represents the IP Family (IPv4 or IPv6). This type is used
// to express the family of an IP expressed by a type (e.g. service.spec.ipFamilies).
// +enum
type IPFamily string

const (
	// IPv4Protocol indicates that this IP is IPv4 protocol
	IPv4Protocol IPFamily = "IPv4"
	// IPv6Protocol indicates that this IP is IPv6 protocol
	IPv6Protocol IPFamily = "IPv6"

	"podCIDRs":      "podCIDRs represents the IP ranges assigned to the node for usage by Pods on that node. If this field is specified, the 0th entry must match the podCIDR field. It may contain at most 1 value for each of IPv4 and IPv6.",
	"providerID":    "ID of the node assigned by the cloud provider in the format: <ProviderName>://<ProviderSpecificNodeID>",