return nil
}

// ClearEntriesForIP is part of Interface
func (ct *execCT) ClearEntriesForIP(ip string, protocol v1.Protocol) error {
	parameters := parametersWithFamily(utilnet.IsIPv6String(ip), "-D", "--orig-dst", ip, "-p", protoStr(protocol))
	err := ct.exec(parameters...)
	if err != nil && !strings.Contains(err.Error(), noConnectionToDelete) {

	endpoints := []discovery.Endpoint{}
	isIPv6AddressType := addressType == discovery.AddressTypeIPv6

	for _, address := range addresses {
		if utilnet.IsIPv6String(address.IP) == isIPv6AddressType {
			endpoints = append(endpoints, endpointFromAddress(address, ready))
		}
	}

	return endpoints
}

	host, port, err := net.SplitHostPort(bindAddress)
	if err != nil {
		// should never happen
		return "", "", fmt.Errorf("invalid server bind address: %q", bindAddress)
	}

	isIPv6 := netutils.IsIPv6String(host)

	// Value is expected to be an IP or DNS name, not "0.0.0.0".
	if host == "0.0.0.0" || host == "::" {
		// Get ip of local interface, but fall back to "localhost".

	// probeHostname returns the correct localhost IP address family based on the endpoint AdvertiseAddress
	probeHostname, probePort, probeScheme := staticpodutil.GetEtcdProbeEndpoint(&cfg.Etcd, utilsnet.IsIPv6String(endpoint.AdvertiseAddress))
	return staticpodutil.ComponentPod(
		v1.Container{
			Name:            kubeadmconstants.Etcd,
			Command:         getEtcdCommand(cfg, endpoint, nodeName, initialCluster),

		if len(service.Spec.ClusterIP) == 0 || service.Spec.ClusterIP == v1.ClusterIPNone {
			return ""
		}

		IsIPv6Family := (ipFamily == v1.IPv6Protocol)
		if IsIPv6Family == netutils.IsIPv6String(service.Spec.ClusterIP) {
			return service.Spec.ClusterIP
		}

		return ""
	}

	for idx, family := range service.Spec.IPFamilies {
		if family == ipFamily {

	}

	return nil, false, fmt.Errorf("Spec does not reference a NFS volume type")
}

func getServerFromSource(source *v1.NFSVolumeSource) string {
	if netutil.IsIPv6String(source.Server) {
		return fmt.Sprintf("[%s]", source.Server)
	}
	return source.Server

			// upgrade is completed (controller connects to api-server that correctly defaults services)
			if utilnet.IsIPv6String(pod.Status.PodIP) {
				ipFamily = v1.IPv6Protocol
			}
		}
	}

	// find an ip that matches the family
	for _, podIP := range pod.Status.PodIPs {
		if (ipFamily == v1.IPv6Protocol) == utilnet.IsIPv6String(podIP.IP) {
			endpointIP = podIP.IP
			break
		}
	}

	if endpointIP == "" {

			continue
		}

		// Filter out the incorrect IP version case. Any endpoint port that
		// contains incorrect IP version will be ignored.
		if (cache.ipFamily == v1.IPv6Protocol) != utilnet.IsIPv6String(endpoint.Addresses[0]) {
			// Emit event on the corresponding service which had a different IP
			// version than the endpoint.

	r.muTree.Lock()
	defer r.muTree.Unlock()
	r.tree = tree
	return nil
}

func newIPAddress(name string, svc *v1.Service) *networkingv1alpha1.IPAddress {
	family := string(v1.IPv4Protocol)
	if netutils.IsIPv6String(name) {
		family = string(v1.IPv6Protocol)
	}
	return &networkingv1alpha1.IPAddress{
		ObjectMeta: metav1.ObjectMeta{
			Name: name,
			Labels: map[string]string{

		// 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"
			}
		}

		var name = p.Name
		if name == "" {