> define zone based?

https://support.vyos.io/en/support/solutions/articles/103000...

You create a _zone_. You name it and assign some interfaces to it. For my needs, I only assign 1 interface per zone. Then, you specify with which other zone that zone can receive traffic from. That also comes with the identification of a firewall rulesets to apply to that pair.

So, `'Zone WAN (iface eth0) <- Zone LAN (iface eth1)' => apply fw LAN-TO-WAN`

When you do that, the firewall rules become much simpler to write and maintain.

But, a best practice is to assign every zone to every other zone. This soon becomes a combinatorial nightmare. When you want to add a zone, you have to create 2xN new zone configurations and 2xN new firewall rulesets.