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Spirent KB Article
Doc ID: FAQ17363
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VR5:Why I can't get IP address after downgrade from v3.32 to v3.2x release?
For newly shipped VR5, with network interface controller settings like below:
Internal NIC: "Local Area Connection Internal"
External NIC: "Local Area Connection User"
This NIC setting indicate it is a new embedded PC, the older version of VR5 firmware won't supported.
If you really need to do an firmware downgrade, contact with Spirent personnel for assistance.
Product : VR5