Hello,
Recently i copy configuration from one 751U-2HnD to another
(Files->Backup and Files->Restore)
And now i get MAC-address conflict in my LAN!
Now ethernet ports on two routers have same MAC!
How can i disable by default MAC-address in the Backup/Restore process?
No you can’t. The backup/restore is not meant to be used to duplicate configurations like that. You should try an “export compact” and then import/paste it into a new blank router. The export compact doesn’t normally export any MAC addresses for Ethernets.
You can also reset the MAC addresses to factory with the command:
/interface ethernet reset-mac-address ether1