// what IP families are supported (and whether the configuration is usable at all).
func (s *ProxyServer) platformCheckSupported(ctx context.Context) (ipv4Supported, ipv6Supported, dualStackSupported bool, err error) {
	// Check if Kernel proxier can be used at all
	_, err = winkernel.CanUseWinKernelProxier(winkernel.WindowsKernelCompatTester{})
	if err != nil {
		return false, false, false, err

func (s *ProxyServer) platformCheckSupported(ctx context.Context) (ipv4Supported, ipv6Supported, dualStackSupported bool, err error) {
	logger := klog.FromContext(ctx)

	if isIPTablesBased(s.Config.Mode) {
		ipt, _ := getIPTables(v1.IPFamilyUnknown)
		ipv4Supported = ipt[0].Present()
		ipv6Supported = ipt[1].Present()

		if !ipv4Supported && !ipv6Supported {
			err = fmt.Errorf("iptables is not available on this host")

// what IP families are supported (and whether the configuration is usable at all).
func (s *ProxyServer) platformCheckSupported(ctx context.Context) (ipv4Supported, ipv6Supported, dualStackSupported bool, err error) {
	return false, false, false, unsupportedError
}

// createProxier creates the proxy.Provider

		logger.Error(err, "Kube-proxy configuration may be incomplete or incorrect")
	}

	ipv4Supported, ipv6Supported, dualStackSupported, err := s.platformCheckSupported(ctx)
	if err != nil {
		return nil, err
	} else if (s.PrimaryIPFamily == v1.IPv4Protocol && !ipv4Supported) || (s.PrimaryIPFamily == v1.IPv6Protocol && !ipv6Supported) {
		return nil, fmt.Errorf("no support for primary IP family %q", s.PrimaryIPFamily)