istio virtualservice ipv6 upstream

Istio VirtualService also supports IPv6 addresses for upstream services. You can specify an IPv6 address for the destination host in the VirtualService configuration YAML file. Here is an example:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: my-virtual-service
spec:
  hosts:
  - example.com
  http:
  - route:
    - destination:
        host: [2001:db8::1]
        port:
          number: 8080

In the above example, the VirtualService is configured to route traffic to an upstream service with an IPv6 address (`[2001:db8::1]`) and port `8080`. Note that the IPv6 address is enclosed in square brackets.

You can also configure Istio to use DNS resolution for upstream services with IPv6 addresses. Simply specify the DNS name that resolves to the IPv6 address in the `host` field of the VirtualService configuration YAML file.