With this in mind, Ztunnel supports two xDS resources: `Address` and `Authorization`.

### Address Type

The primary configuration consumed by Ztunnel is the [`Address` resource](../../pkg/workloadapi/workload.proto).
As the name suggests, an `Address` represents a particular IP Address.
This can be a `Service` or a `Workload`.

The address type has the following goals:

    port: {{ $val.Port }}
    protocol: TCP
    appProtocol: {{ $val.AppProtocol }}
  {{- end }}
  selector:
    "{{.GatewayNameLabel}}": "{{.Name}}"
  {{- if and (.Spec.Addresses) (eq .ServiceType "LoadBalancer") }}
  loadBalancerIP: {{ (index .Spec.Addresses 0).Value | quote}}
  {{- end }}
  type: {{ .ServiceType | quote }}

    port: {{ $val.Port }}
    protocol: TCP
    appProtocol: {{ $val.AppProtocol }}
  {{- end }}
  selector:
    "{{.GatewayNameLabel}}": {{.Name}}
  {{- if and (.Spec.Addresses) (eq .ServiceType "LoadBalancer") }}
  loadBalancerIP: {{ (index .Spec.Addresses 0).Value | quote}}
  {{- end }}
  type: {{ .ServiceType | quote }}

  // +optional
  optional QueuingConfiguration queuing = 2;
}

// LimitedPriorityLevelConfiguration specifies how to handle requests that are subject to limits.
// It addresses two issues:
//   - How are requests for this priority level limited?
//   - What should be done with requests that exceed the limit?
message LimitedPriorityLevelConfiguration {

  // +optional
  optional QueuingConfiguration queuing = 2;
}

// LimitedPriorityLevelConfiguration specifies how to handle requests that are subject to limits.
// It addresses two issues:
//   - How are requests for this priority level limited?
//   - What should be done with requests that exceed the limit?
message LimitedPriorityLevelConfiguration {

EOF
}

function ips_to_cidrs() {
  IP_RANGE_START="$1"
  IP_RANGE_END="$2"
  python3 - <<EOF
from ipaddress import summarize_address_range, IPv4Address
[ print(n.compressed) for n in summarize_address_range(IPv4Address(u'$IP_RANGE_START'), IPv4Address(u'$IP_RANGE_END')) ]
EOF

					},
					configdump.ListenerFilter{
						Address: address,
						Port:    uint32(port),
						Type:    listenerType,
						Verbose: verboseProxyConfig,
					},
					configdump.RouteFilter{
						Name:    routeName,
						Verbose: verboseProxyConfig,
					},
					configdump.EndpointFilter{
						Address: address,
						Port:    uint32(port),
						Cluster: clusterName,

			}
			if err := f.Start(); err != nil {
				return nil, err
			}
			address = fmt.Sprintf("https://%s%s", f.Address(), *cc.Service.Path)
			defer func() {
				f.Close()
				f.WaitForStop()
			}()
		}
		tlsClientConfig.ServerName = fmt.Sprintf("%s.%s.%s", cc.Service.Name, cc.Service.Namespace, "svc")
	} else if isMCPAddr(address) {
		var err error

		if err != nil {
			return nil, err
		}
		err = fw.Start()
		if err != nil {
			return nil, err
		}
		defer fw.Close()
		xdsOpts.Xds = fw.Address()
		response, err := GetXdsResponse(dr, istioNamespace, tokenServiceAccount, xdsOpts, dialOpts)
		if err != nil {
			return nil, fmt.Errorf("could not get XDS from discovery pod %q: %v", pod.Name, err)
		}

				return fmt.Errorf("could not start port forwarder for ControlZ %s: %v", podName, err)
			}

			ctrlzClient := &ControlzClient{
				baseURL: &url.URL{
					Scheme: "http",
					Host:   portForwarder.Address(),
					Path:   "scopej",
				},
				httpClient: &http.Client{},
			}
			istiodConfigCmd := chooseClientFlag(ctrlzClient, istiodReset, outputLogLevel, stackTraceLevel, outputFormat)