External hosts in the 10.88.0.0/16 subnet cannot access or ssh to Red Hat OpenShift Container Platform nodes or pods by default

Solution In Progress - Updated -

Issue

  • When using Red Hat OpenShift Container Platform, the podman container engine utility comes present on Red Hat CoreOS nodes automatically.
  • If an external host within your network is on a 10.88.0.0/16 subnet, it will be unable to reach the OpenShift cluster's nodes or pods after installation.
  • How do I ensure that hosts within my network with an IPv4 address in the 10.88.0.0/16 range can reach my OpenShift 4 cluster?

Environment

  • Red Hat OpenShift Container Platform 4
    • Tested in OpenShift 4.12
    • Tested in OpenShift 4.13

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