traefik/pkg/provider/kubernetes/crd/fixtures/tcp/with_middleware_crossprovider.yml

apiVersion: traefik.io/v1alpha1
kind: MiddlewareTCP
metadata:
  name: ipwhitelist
  namespace: default
spec:
  ipWhiteList:
    sourceRange:
      - 127.0.0.1/32

---
apiVersion: traefik.io/v1alpha1
kind: MiddlewareTCP
metadata:
  name: ipwhitelist
  namespace: foo
spec:
  ipWhiteList:
    sourceRange:
      - 127.0.0.1/32
---
apiVersion: traefik.io/v1alpha1
kind: IngressRouteTCP
metadata:
  name: test.route
  namespace: default

spec:
  entryPoints:
    - foo

  routes:
    - match: HostSNI(`foo.com`)
      services:
        - name: whoamitcp
          port: 8000

      middlewares:
        - name: ipwhitelist
        - name: ipwhitelist
          namespace: foo
        - name: ipwhitelist@file
        - name: ipwhitelist-foo@file
          namespace: foo