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Only issue with that is up time. Laptops have a tendency to go into sleep mode so if it does you lose DNS. Just gotta make sure it doesn’t do that. I know some are incredibly annoying with power settings and you can’t get rid of that behavior (Lenovo…).
This is old, but the diagrams in the first answer show you how to tag the ports to get the same setup as you described above:
https://superuser.com/questions/789294/can-i-send-a-wan-and-lan-connection-over-the-same-cable