> For the complete documentation index, see [llms.txt](https://nishanthkp.gitbook.io/kubernetes-security-with-calico-and-istio/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nishanthkp.gitbook.io/kubernetes-security-with-calico-and-istio/istio/peer-auth.md).

# Peer Authentication

Apply the below policy to enforce the Security between the Peers.

```bash
kubectl create -f - <<EOF
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: default-strict-mode
  namespace: istio-system
spec:
  mtls:
    mode: STRICT
EOF
```