2 Ethernet ports with 1 LAN and 2 WANs - best approach?

[windswept321]

I'm setting up an embedded box which has 2 integrated Intel gigabit ports. I have a gigabit local network and two WANs - 30mb 'FTTC' and circa 15 - 20mb 4G / LTE.

What would the best configuration be here?

Bond the ports and try setting up additional VLANs for the WANs?
Buy a USB3 network interface for the LTE WAN?

Thanks

[yourfriendarmando]

Here are my recommendations to live a healthy life with few calls from an angry client, or guests if at home:

I would recommend against USB anything for things that are permanently attached to the network. It could be less stable having an additional signal conversion.

If possible, add another interface(s) if you have a slot, or get a machine with 4 interfaces. Simplify configuration between interfaces facing the world, and what supplies internally.

The fourth interface could be useful for separating your guest traffic, or a management type port with unfettered access for testing purposes.

Just my thoughts, hopefully you get a rock solid firewall. Cheers