Mutiple Uplinks

[Guest]

[AlanJohnsone]

Hi, I have an EFW installation up and running with Red and Green Zones. I am using NTL Business broadband with 5 fixed IP's. I need to have 2 public IP's one forwarding to https exhange server in the green zone and the second also using ssl for a web application.
I cannot use a DMZ zone as both IP addresses would come through the single MAC address and NTL require each IP address to have a unique registered MAC.
I have registered the MAC address of the Red Zone with NTL and this provides us internet access and forwarding https to our exchange server all OK.
I have registered a 2nd interface card with NTL to give me a second public IP address and have created a second uplink in EFW to use this card and IP address my issue is I cannot get NAT to forward https to the application server - or maybe I can't get trafic from the app server back through that uplink.
I am thinking a second EFW install.

I am confused and help would be appreciated. 
Thanks
Alan