//  - 0 gateways for network4
	ds := environment(t)
	origServices := ds.Env().Services()
	origGateways := ds.Env().NetworkGateways()
	ds.MemRegistry.AddService(&model.Service{
		Hostname: "istio-ingressgateway.istio-system.svc.cluster.local",
		Attributes: model.ServiceAttributes{
			ClusterExternalAddresses: &model.AddressMap{
				Addresses: map[cluster.ID][]string{
					"cluster2a": {""},
					"cluster2b": {""},

	if err != nil {
		// Envoy logs errors again, so no need to log beyond debug level
		log.Debugf("failed to create upstream grpc client: %v", err)
		// Increase metric when xds connection error, for example: forgot to restart ingressgateway or sidecar after changing root CA.
		metrics.IstiodConnectionErrors.Increment()
		return err
	}
	log.Infof("connected to upstream XDS server: %s", p.istiodAddress)

	if ctx.Settings().EnableDualStack {
		args.AppendSet("values.pilot.env.ISTIO_DUAL_STACK", "true")
		args.AppendSet("meshConfig.defaultConfig.proxyMetadata.ISTIO_DUAL_STACK", "true")
		args.AppendSet("values.gateways.istio-ingressgateway.ipFamilyPolicy", "RequireDualStack")
		args.AppendSet("values.gateways.istio-egressgateway.ipFamilyPolicy", "RequireDualStack")
	}

	// Include all user-specified values.
	for k, v := range cfg.Values {