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"Error: Connection activation failed: No suitable device found for this connection (device nic0 not available because device is strictly unmanaged)." というエラーが表示されるのはなぜですか?

Solution In Progress - Updated -

Issue

  • NetworkManager により物理インターフェイスが管理されていません。 nmcli で設定を行っても、変更が反映されません。
  • nmcli con up でデバイスを起動しようとすると、次のエラーが表示されます。
# nmcli con up nic0 
Error: Connection activation failed: No suitable device found for this connection (device nic0 not available because device is strictly unmanaged).

Environment

  • Red Hat Enterprise Linux (RHEL) 7
  • Red Hat Enterprise Linux (RHEL) 8
  • Red Hat Enterprise Linux (RHEL) 9 Beta
  • NetworkManager

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