Allowing any traffic to one network and normally block traffic to another interface

RouterOS Forwarding Protocols
1

Let me explain our setup. We have interface 3,4,5 setup as a switch, with ether 3 being the master. We are doing nat on this network and have the firewall working. This works correctly.

Interface eth 2 has a public IP range and works fine. We need to allow any traffic from the outside world to this IP range. Basically, dont want firewall to control this port.

2

It is what you want.But it is not recommended

/ip firewall filter
add action=accept chain=input in-interface=ether2