Allow to use internal node IPs for NodePort services

pkg/provider/kubernetes/crd/fixtures/udp/services.yml

@@ -221,3 +221,18 @@ spec:
       port: 8000
   type: ClusterIP
   clusterIP: 10.10.0.1
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: nodeport-svc-udp
+  namespace: default
+
+spec:
+  ports:
+    - name: myapp
+      port: 8000
+      nodePort: 32456
+  type: NodePort
+  clusterIP: 10.10.0.1

pkg/provider/kubernetes/crd/fixtures/udp/with_node_port_service_lb.yml

@@ -0,0 +1,25 @@
+apiVersion: traefik.io/v1alpha1
+kind: IngressRouteUDP
+metadata:
+  name: test.route
+  namespace: default
+
+spec:
+  entryPoints:
+    - foo
+
+  routes:
+  - services:
+    - name: nodeport-svc-udp
+      port: 8000
+      nodePortLB: true
+
+---
+kind: Node
+apiVersion: v1
+metadata:
+  name: traefik-node
+status:
+  addresses:
+    - type: InternalIP
+      address: 172.16.4.4