为什么使用istio tcp route无法通过ip访问服务？

Question

当我使用这个VS时，我可以通过1.2.3.4访问我的http服务，但是当我将http更改为tcp时，我无法通过1.2.3.4访问我的http服务，这是怎么回事？

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: httpbin-vir
spec:
  hosts:
    - httpbin.default.svc.cluster.local
    - 1.2.3.4
  http:
    - match:
        - port: 8000
          sourceLabels:
            version: base
      route:
        - destination:
            host: httpbin.default.svc.cluster.local
            subset: base
    - match:
        - port: 8000
          sourceLabels:
            version: feature
      route:
        - destination:
            host: httpbin.default.svc.cluster.local
            subset: feature

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: httpbin-vir
spec:
  hosts:
    - httpbin.default.svc.cluster.local
    - 1.2.3.4
  tcp:
    - match:
        - port: 8000
          sourceLabels:
            version: base
      route:
        - destination:
            host: httpbin.default.svc.cluster.local
            subset: base
    - match:
        - port: 8000
          sourceLabels:
            version: feature
      route:
        - destination:
            host: httpbin.default.svc.cluster.local
            subset: feature

如果这个方法不行，我想知道如何在TCP路由下通过1.2.3.4访问我的服务