I have enabled the API server over insecure port on the private subnet, with the following flag

- --insecure-port=8080
- --insecure-bind-address=0.0.0.0

As a result of this it bypasses authentication and authorization modules. which is perfectly well documented in the https://kubernetes.io/docs/reference/access-authn-authz/controlling-access/

I tried to adding the flag --anonymous-auth=false doesn't solve the purpose

Here is the complete list of API command

- kube-apiserver
- --advertise-address=192.0.3.6
- --allow-privileged=true
- --authorization-mode=Node,RBAC
- --anonymous-auth=false
- --client-ca-file=/etc/kubernetes/pki/ca.crt
- --enable-admission-plugins=NodeRestriction
- --enable-bootstrap-token-auth=true
- --etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt
- --etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt
- --etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key
- --etcd-servers=https://127.0.0.1:2379
- --insecure-port=8080
- --insecure-bind-address=0.0.0.0
- --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt
- --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key
- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
- --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
- --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
- --requestheader-allowed-names=front-proxy-client
- --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
- --requestheader-extra-headers-prefix=X-Remote-Extra-
- --requestheader-group-headers=X-Remote-Group
- --requestheader-username-headers=X-Remote-User
- --secure-port=6443
- --service-account-key-file=/etc/kubernetes/pki/sa.pub
- --service-cluster-ip-range=10.96.0.0/12
- --tls-cert-file=/etc/kubernetes/pki/apiserver.crt
- --tls-private-key-file=/etc/kubernetes/pki/apiserver.key

As per security I know insecure shouldn't be used for communication this is complete isolated network and i'm trying to enable authentication and authorization modules over the insecure port