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  1. OpenShift Bugs
  2. OCPBUGS-41815

Installer should validate MTU for OpenStack custom networks

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    • ShiftStack Sprint 259, ShiftStack Sprint 260, ShiftStack Sprint 261, ShiftStack Sprint 262, ShiftStack Sprint 263, ShiftStack Sprint 264
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      The installer previously didn't validate the MTU for custom networks on OpenStack platforms, which could lead to installation failure when the MTU was too small. For IPv6, the minimum MTU is 1280, and 100 for OVN-kubernetes. The installer now validates the MTU of OpenStack custom networks.
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      The installer previously didn't validate the MTU for custom networks on OpenStack platforms, which could lead to installation failure when the MTU was too small. For IPv6, the minimum MTU is 1280, and 100 for OVN-kubernetes. The installer now validates the MTU of OpenStack custom networks.

      This is a clone of issue OCPBUGS-41813. The following is the description of the original issue:
      —
      This is a clone of issue OCPBUGS-41812. The following is the description of the original issue:
      —
      This is a clone of issue OCPBUGS-41785. The following is the description of the original issue:
      —
      Context: https://redhat-internal.slack.com/archives/CH98TDJUD/p1682969691044039?thread_ts=1682946070.139719&cid=CH98TDJUD

      If a neutron network MTU is too small, br-ex will be set to 1280 anyway, which might be problematic if the neutron mtu is smaller than that. we should have some validation in the installer to prevent this.

      We need an MTU of 1380 at least, where 1280 is the minimum allowed for IPv6 + 100 for the OVN-Kubernetes encapsulation overhead.

              maandre@redhat.com Martin André
              openshift-crt-jira-prow OpenShift Prow Bot
              Itshak Brown Itshak Brown
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                Updated: