2 pysical ethernet devices

Hi

With mgmt_interface i definite the management Network Device. (f.e. eth1 in Dark-Fiber without Internet)
How do i definite the open external Network Device with Internet? (f.e. eth0)
I don’t need to say that over this eth0 no Cluster or Server communication shout go.
Only external Downloads and Requests.

I looks like there are high priority plans for additional networking features and NIC management.