How does an external load balancer identify all possible istio ingress gateways

Networking
1

When using an external load balancer, how does it identify which istio ingress gateway it can possibly hit i.e. I can manually access :/

  1. Is this manually configured or does the load balancer consume this info from an API
  2. Is there a recommended strategy for bypassing an external load balancer eg. roundrobin across a DNS which is aware of the node ip / port ?

Thanks

Here’s a sample where i manually identify the node host / port

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