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  1. OpenShift Bugs
  2. OCPBUGS-41813

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
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      * Previously, the installation program did not validate the maximum transmission unit (MTU) for a custom IPv6 network on {op-system-first}. If you specified a low value for the MTU, installation of the cluster would fail. With this release, the minimum MTU value for IPv6 networks is set to `1380 octets, where `1280` octets is the minimum MTU for the IPv6 protocol and the remaining `100` octets is for the OVN-Kubernetes encapsulation overhead. With this release, the installation program now validates the MTU for a custom IPv6 network on {op-system-first} (link:https://issues.redhat.com/browse/OCPBUGS-41813[*OCPBUGS-41813*])
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      * Previously, the installation program did not validate the maximum transmission unit (MTU) for a custom IPv6 network on {op-system-first}. If you specified a low value for the MTU, installation of the cluster would fail. With this release, the minimum MTU value for IPv6 networks is set to `1380 octets, where `1280` octets is the minimum MTU for the IPv6 protocol and the remaining `100` octets is for the OVN-Kubernetes encapsulation overhead. With this release, the installation program now validates the MTU for a custom IPv6 network on {op-system-first} (link: https://issues.redhat.com/browse/OCPBUGS-41813 [* OCPBUGS-41813 *])
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      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
              Ramón Lobillo Ramón Lobillo
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