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https://kubernetes.io/docs/concepts/services-networking/service/#defining-a-service https://kubernetes.io/docs/concepts/services-networking/service/#virtual-ips-and-service-proxies
The range listed is used for the virtual IPs for the services. For example:
kubectl get svc -A -o=custom-columns='DATA:spec.clusterIP'
DATA
172.20.74.199
172.20.0.1
172.20.123.203
172.20.0.10
answered 2 years ago
1
This is the IP address range used by Kubernetes services, see the launch announcement and the relevant documentation (click "AWS Management Console" tab and scroll down to the relevant description).
answered 2 years ago
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Thanks, that's helpful. So if I understand it right, this range is used for ClusterIP services which are only accessible to containers running in the cluster. Packets addressed to them are intercepted by iptables rules and redirected. That means that they never make it to an actual network interface which is why the addresses can and should be outside of the CIDR range used by the VPC.