5.4. Encryption in Transit
You need to enable IPsec so that all the network traffic between the nodes on the OVN-Kubernetes Container Network Interface (CNI) cluster network travels through an encrypted tunnel.
By default, IPsec is disabled. You can enable it either during or after installing the cluster. If you need to enable IPsec after cluster installation, you must first resize your cluster MTU to account for the overhead of the IPsec ESP IP header.
For more information on how to configure the IPsec encryption, see Configuring IPsec encryption of the Networking guide in OpenShift Container Platform documentation.
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