With IPsec enabled, all network traffic between nodes on the OVN-Kubernetes Container Network Interface (CNI) cluster network travels through an encrypted tunnel.
IPsec is disabled by default.
IPsec encryption can be enabled only during cluster installation and cannot be disabled after it is enabled. For installation documentation, refer to Selecting a cluster installation method and preparing it for users.
With IPsec enabled, only the following network traffic flows between pods are encrypted:
Traffic between pods on different nodes on the cluster network
Traffic from a pod on the host network to a pod on the cluster network
The following traffic flows are not encrypted:
Traffic between pods on the same node on the cluster network
Traffic between pods on the host network
Traffic from a pod on the cluster network to a pod on the host network
The encrypted and unencrypted flows are illustrated in the following diagram:
The encrypt cipher used is
AES-GCM-16-256. The integrity check value (ICV) is
16 bytes. The key length is
The IPsec tunnel mode used is Transport mode, a mode that encrypts end-to-end communication.
The Cluster Network Operator (CNO) generates a self-signed X.509 certificate authority (CA) that is used by IPsec for encryption. Certificate signing requests (CSRs) from each node are automatically fulfilled by the CNO.
The CA is valid for 10 years. The individual node certificates are valid for 5 years and are automatically rotated after 4 1/2 years elapse.