PPPOE with static two ip

Hi, need you guys advise on how to do this as i can't find the right instructions from this forum and the documentation...

I am currently using my ISP provided D-link DIR-615 router + endian firewall, and going to replace both with single smallwall box.

I have PPPOE with static IP which i assigned to nic1 which working fine and my LAN is getting internet access.  My internet service package comes with additional fixed public IP which i am trying to figure it out how to configure in smallwall but no luck.

This is my configuration: -

4 NICs in my smallwall box:
nic1 : WAN - 123.123.123.123(sample IP) (connected using PPPOE with Static IP)
nic2 : LAN - 192.168.0.1 (for LAN, working fine, all computers getting internet access)
nic3 : DMZ - 192.168.1.1 (working fine)
nic4 : WiFi - 192.168.2.1 (working fine, connecting to a wireless access point) 

now, the additional fixed public IP says 123.123.123.124 which i am stuck on where and how to configure it so that later i can NAT port forward the request to the dmz.

My current DIR-615 router is configured with: -

- static PPPOE for .123
- "Unnumbered IP" for the .124 public IP
- in my endian firewall nic i fixed this .124 IP and NAT is working fine.


Thanks in advanced.