Specify Port Range

I have configured my Kubernetes cluster to only use ports 10000-12000 due to security restrictions at my company. I am forcing the value by specifying:

   - --service-node-port-range=10000-12000

in /etc/kubernetes/manifests/kube-apiserver.yaml

This appears to work fine, however, as I go through the ISTIO “getting started” guide, the gateway continues to open ports outside of this range.

NAME                   TYPE           CLUSTER-IP    EXTERNAL-IP   PORT(S)                                                                                                                                      AGE
istio-ingressgateway   LoadBalancer   10.96.132.4   <pending>     15020:30861/TCP,80:31228/TCP,443:30208/TCP,15029:30503/TCP,15030:31507/TCP,15031:32005/TCP,15032:30062/TCP,31400:31232/TCP,15443:30243/TCP   12d

How can I force ISTIO to only open ports 10000-12000?

Thanks in advance.