func (s *ProxyServer) platformSetup(ctx context.Context) error {
	// Preserve backward-compatibility with the old secondary IP behavior
	if s.PrimaryIPFamily == v1.IPv4Protocol {
		s.NodeIPs[v1.IPv6Protocol] = net.IPv6zero
	} else {
		s.NodeIPs[v1.IPv4Protocol] = net.IPv4zero
	}
	return nil
}

// platformCheckSupported is called immediately before creating the Proxier, to check

	}
	if len(allIPs) == 0 {
		return nil, fmt.Errorf("host IP unknown; known addresses: %v", node.Status.Addresses)
	}

	nodeIPs := []net.IP{allIPs[0]}
	for _, ip := range allIPs {
		if netutils.IsIPv6(ip) != netutils.IsIPv6(nodeIPs[0]) {
			nodeIPs = append(nodeIPs, ip)
			break
		}
	}

	return nodeIPs, nil
}

// GetNodeHostIP returns the provided node's "primary" IP; see GetNodeHostIPs for more details

	// It doesn't matter whether we listen on "0.0.0.0", "::", or ""; go
	// treats them all the same.
	nodeIPs := []net.IP{net.IPv4zero}

	if !nodePortAddresses.MatchAll() {
		ips, err := nodePortAddresses.GetNodeIPs(proxyutil.RealNetwork{})
		if err == nil {
			nodeIPs = ips
		} else {

				}
			} else if tc.expectIPs == nil {
				t.Errorf("expected error, got %v", nodeIPs)
			} else if !reflect.DeepEqual(nodeIPs, tc.expectIPs) {
				t.Errorf("expected %v, got %v", tc.expectIPs, nodeIPs)
			} else if !nodeIP.Equal(nodeIPs[0]) {
				t.Errorf("GetNodeHostIP did not return same primary (%s) as GetNodeHostIPs (%s)", nodeIP.String(), nodeIPs[0].String())
			}
		})
	}
}

func TestIsNodeReady(t *testing.T) {

				config.IPTables.MinSyncPeriod.Duration,
				config.IPTables.MasqueradeAll,
				*config.IPTables.LocalhostNodePorts,
				int(*config.IPTables.MasqueradeBit),
				localDetectors,
				s.Hostname,
				s.NodeIPs,
				s.Recorder,
				s.HealthzServer,
				config.NodePortAddresses,
				initOnly,
			)
		} else {

				cloud = &fakecloud.Cloud{
					Addresses: testCase.nodeAddresses,
					Err:       nil,
				}
			}

			nodeIPs := []net.IP{testCase.nodeIP}
			if testCase.secondaryNodeIP != nil {
				nodeIPs = append(nodeIPs, testCase.secondaryNodeIP)
			}

			// construct setter
			setter := NodeAddress(nodeIPs,
				nodeIPValidator,
				hostname,
				testCase.hostnameOverride,

func NewConfigurer(recorder record.EventRecorder, nodeRef *v1.ObjectReference, nodeIPs []net.IP, clusterDNS []net.IP, clusterDomain, resolverConfig string) *Configurer {
	return &Configurer{
		recorder:         recorder,
		getHostDNSConfig: getHostDNSConfig,
		nodeRef:          nodeRef,
		nodeIPs:          nodeIPs,
		clusterDNS:       clusterDNS,
		ClusterDomain:    clusterDomain,
		ResolverConfig:   resolverConfig,

			return false, nil
		}
		nodeIPs, err = utilnode.GetNodeHostIPs(node)
		if err != nil {
			logger.Error(err, "Failed to retrieve node IPs")
			return false, nil
		}
		return true, nil
	})
	if err == nil {
		logger.Info("Successfully retrieved node IP(s)", "IPs", nodeIPs)
	}
	return nodeIPs

) Setter {
	var nodeIP, secondaryNodeIP net.IP
	if len(nodeIPs) > 0 {
		nodeIP = nodeIPs[0]
	}
	preferIPv4 := nodeIP == nil || nodeIP.To4() != nil
	isPreferredIPFamily := func(ip net.IP) bool { return (ip.To4() != nil) == preferIPv4 }
	nodeIPSpecified := nodeIP != nil && !nodeIP.IsUnspecified()

	if len(nodeIPs) > 1 {
		secondaryNodeIP = nodeIPs[1]
	}

	"istio.io/istio/pkg/log"
)

type envoy struct {
	ProxyConfig
	extraArgs []string
}

// Envoy binary flags
type ProxyConfig struct {
	LogLevel          string
	ComponentLogLevel string
	NodeIPs           []string
	Sidecar           bool
	LogAsJSON         bool
	OutlierLogPath    string

	BinaryPath    string
	ConfigPath    string
	ConfigCleanup bool
	AdminPort     int32