Forward Public IP

I’ll try to explain my setup as best I can, I have been assigned 6 static IP’s from my ISP and I currently using the first one in my range for exchange server,

DSL Modem>>>MT 450>>>Ether1>>>To datacenter
Ether3>>>to Att netgate
Ether5>>>to Clients

I have my modem in bridge modem and the MT doing the PPPoE authentication, and everything on Ether1 and 5 are working fine, both are working on internal private IP’s

But I’m have assigned the ATT Netgate the second public IP I have and I am trying to forward the traffic directed to that IP to it,

thanks

My config (2 IPs from ISP).

ether1 and ether2 bridged. Incoming internet and web/mail server on that
ether3-5 bridged - internal network and fileserver on that.

masquerade from WAN bridge to LAN bridge.

If to complicated - get a beer.

Assign your public IP addresses you are getting from ATT to Ether3 and set up a one-to-one NAT in /ip firewall nat to the internal IP addresses you desire.