Using CNAME records on DNS to map traffic to Istio ingress on GCP

Networking
1

We have a cluster running on GCP, with Istio ingress set up on it.

We are currently in a process of adding a DNS record to map from example.site2.com to example.site1.com. We have setup the gateway currently withe following config:

  Hosts:
      *.example.site1.com
    Port:
      Name:      https-wc
      Number:    443
      Protocol:  HTTPS
    Tls:
      Credential Name:  ingressgateway-wc-certs
      Mode:             SIMPLE
    Hosts:
      example.site1.con
    Port:
      Name:      https-base
      Number:    443
      Protocol:  HTTPS

We currently have an A record which is mapping *.example.site1.com to the ingress external IP address. Our intention is to map all traffic from example.site2.com to example.site1.com. Currently we get an NR (Not DestinationRule or VirtualService) error when visiting example.site2.com. Is this achievable?

2

AFAIK you cannot do that if the client still calls example.site2.com, since Istio gateway match based on SNI or Host header

gateway only understand example.site1.com, but client init the connection with example.site2.com