Firewall with multiple IPs

I'm having tons of problems with configuring IP Chains to firewall my entire subnet.

Basically I want my firewall to act as a gateway for all outgoing and incoming traffic. It seems like it can do so if there was only 1 external ip address. However, I need to do this for all of my internal servers that have many public ip addresses.

The problem with IP Chains is that it doesn't seem to do 1-to-1 NATing.

Can someone help?

 

 

 

 

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