When using Istio with Kubernetes, is an overlay network still required for each node?
I have read the FAQ's and the documentation, but cannot see anything that directly references this.
Istio is built upon the Kubernetes. It creates sidecar containers in the Kubernetes Pods for routing requests, gathering metrics and so on. But still, it requires a way for Pods to communicate with each other. Therefore, Kubernetes network overlay is required.
For additional information, you can start from the following link.