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+# Configuring ExternalDNS to use Gateway API Route Sources
+
+This describes how to configure ExternalDNS to use Gateway API Route sources.
+It is meant to supplement the other provider-specific setup tutorials.
+
+## Supported API Versions
+
+The currently supported version of Gateway API is v1alpha2. However, the maintainers of ExternalDNS
+make no backwards compatibility guarantees with alpha versions of the API. Future releases may only
+support beta or stable API versions.
+
+## Hostnames
+
+HTTPRoute and TLSRoute specs, along with their associated Gateway Listeners, contain hostnames that
+will be used by ExternalDNS. However, no such hostnames may be specified in TCPRoute or UDPRoute
+specs. For TCPRoutes and UDPRoutes, the `external-dns.alpha.kubernetes.io/hostname` annotation
+is the recommended way to provide their hostnames to ExternalDNS. This annotation is also supported
+for HTTPRoutes and TLSRoutes by ExternalDNS, but it's _strongly_ recommended that they use their
+specs to provide all intended hostnames, since the Gateway that ultimately routes their
+requests/connections won't recognize additional hostnames from the annotation.
+
+## Manifest with RBAC
+```yaml
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: external-dns
+  namespace: default
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: external-dns
+rules:
+- apiGroups: [""]
+  resources: ["namespaces"]
+  verbs: ["get","watch","list"]
+- apiGroups: ["gateway.networking.k8s.io"]
+  resources: ["gateways","httproutes","tlsroutes","tcproutes","udproutes"] 
+  verbs: ["get","watch","list"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: external-dns
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: external-dns
+subjects:
+- kind: ServiceAccount
+  name: external-dns
+  namespace: default
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: external-dns
+  namespace: default
+spec:
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: external-dns
+  template:
+    metadata:
+      labels:
+        app: external-dns
+    spec:
+      serviceAccountName: external-dns
+      containers:
+      - name: external-dns
+        image: k8s.gcr.io/external-dns/external-dns:v0.10.0
+        args:
+        # Add desired Gateway API Route sources.
+        - --source=gateway-httproute
+        - --source=gateway-tlsroute
+        - --source=gateway-tcproute
+        - --source=gateway-udproute
+        # Optionally, limit Routes to those in the given namespace.
+        - --namespace=my-route-namespace
+        # Optionally, limit Routes to those matching the given label selector.
+        - --label-filter=my-route-label==my-route-value
+        # Optionally, limit Route endpoints to those Gateways in the given namespace.
+        - --gateway-namespace=my-gateway-namespace
+        # Optionally, limit Route endpoints to those Gateways matching the given label selector.
+        - --gateway-label-filter=my-gateway-label==my-gateway-value
+        # Add provider-specific flags...
+        - --domain-filter=external-dns-test.my-org.com
+        - --provider=google
+        - --registry=txt
+        - --txt-owner-id=my-identifier
+```