Problem Description
The customer device is VAC1000, version ESS 5466P01, and the service is running normally. However, when applying for the license, it was found that there are two did files in the flash, one matching the device serial number and the other not matching the device serial number.
Process Analysis
Check other devices of the customer. There are multiple VAC devices. Other devices have only one did file each, while this device has two. Through communication, it was found that the customer replaced the device network card.
Solution
The VAC serial number is partially generated based on the MAC address of the incoming network card. If the MAC address of the incoming network card changes, the did file will be regenerated.