What is the Purpose of 'opt' Interface Mapping?

[Al Muckart]

I've been configuring multiple firewalls that need to be identical recently and I got curious.

What is the purpose of abstracting OS interfaces to OPNsense's 'optN' interfaces, vs. using the OS names directly?

Thanks.

[Patrick M. Hausen]

The OS names change when the hardware does.

Switch from 1G to 10G by adding a new 10G NIC? Simply reassign the logical interface to the new device - done. IP configuration, DHCP, firewall rules, NAT, ... all will just follow with a single click.

[Al Muckart]

Right, that makes perfect sense, thank you.