}
		if tc.expectStackDowngrade && len(want.Spec.IPFamilies) > len(got.Spec.ClusterIPs) {
			want.Spec.IPFamilies = want.Spec.IPFamilies[0:1]
		} else if len(got.Spec.IPFamilies) > len(want.Spec.IPFamilies) {
			want.Spec.IPFamilies = append(want.Spec.IPFamilies, got.Spec.IPFamilies[len(want.Spec.IPFamilies):]...)
		}
	}

	if tc.expectNodePorts {
		for i := range want.Spec.Ports {

```

COS image will experience dev, beta, stable and LTS stage. Before LTS stage, image is named with its
family as a prefix, e.g cos-dev, cos-beta, cos-stable. However, the milestone
number in those families may change when channel promotions happen. Only when a milestone becomes LTS, the
image will have a new family, and the milestone number in the image name stays the same. The image

	{"tcp4", "127.0.0.1", "tcp6", "::1", nil},
	{"tcp6", "::1", "tcp4", "127.0.0.1", nil},
}

// TestDualStackTCPListener tests both single and double listen
// to a test listener with various address families, different
// listening address and same port.
//
// On DragonFly BSD, we expect the kernel version of node under test
// to be greater than or equal to 4.4.
func TestDualStackTCPListener(t *testing.T) {

// "tcp" and "udp" networks does not listen for both IPv4 and IPv6
// connections. This is due to the fact that IPv4 traffic will not be
// routed to an IPv6 socket - two separate sockets are required if
// both address families are to be supported.
// See inet6(4) for details.

type ipStackCapabilities struct {
	sync.Once             // guards following
	ipv4Enabled           bool
	ipv6Enabled           bool
	ipv4MappedIPv6Enabled bool

				ClusterIP:  "192.168.1.1",
				ClusterIPs: []string{"192.168.1.1"},
				IPFamilies: []corev1.IPFamily{corev1.IPv4Protocol},
			},
		},
		&corev1.Service{
			ObjectMeta: metav1.ObjectMeta{Namespace: "two", Name: "two"},
			Spec: corev1.ServiceSpec{
				ClusterIP:  "192.168.1.100",
				ClusterIPs: []string{"192.168.1.100"},
				IPFamilies: []corev1.IPFamily{corev1.IPv4Protocol},
			},
		},

  ServiceAccount serviceAccount = 28;

  // Defines which IP family to use for single stack or the order of IP families for dual-stack.
  // Valid list items are "IPv4", "IPv6".
  // More info: https://kubernetes.io/docs/concepts/services-networking/dual-stack/#services
  repeated string ipFamilies = 29;

  // Controls whether Services are configured to use IPv4, IPv6, or both. Valid options

			HostIP:        p.HostIP,
		}

		// We need to determine the address family this entry applies to. We do this to ensure
		// duplicate containerPort / protocol rules work across different address families.
		// https://github.com/kubernetes/kubernetes/issues/82373
		family := "any"
		if p.HostIP != "" {
			if utilsnet.IsIPv6String(p.HostIP) {
				family = "v6"
			} else {
				family = "v4"
			}
		}

		if dual, _ := netutils.IsDualStackCIDRStrings(config); dual {
			anyDualStackConfig = true
			break
		}
	}

	// Warn if NodePortAddresses does not limit connections on all IP families that
	// seem to be in use.
	cidrsByFamily := proxyutil.MapCIDRsByIPFamily(s.Config.NodePortAddresses)
	if len(s.Config.NodePortAddresses) == 0 {

		"associated interface(s) must be reachable by the rest of the cluster, and by CLI/web "+
		"clients. If blank or an unspecified address (0.0.0.0 or ::), all interfaces and IP address families will be used.")

	desc := "The port on which to serve HTTPS with authentication and authorization."
	if s.Required {
		desc += " It cannot be switched off with 0."
	} else {

	fs.Var(&utilflag.IPVar{Val: &c.Address}, "address", "The IP address for the Kubelet to serve on (set to '0.0.0.0' or '::' for listening on all interfaces and IP address families)")
	fs.Int32Var(&c.Port, "port", c.Port, "The port for the Kubelet to serve on.")