Adding a Second IP Address to my External Interface


I have a T80 Firebox, and I have a Business class Cable Modem for ISP. The ISP has provided me with a block of 5 ip addresses. The first address has been successfully configured to the external interface, and everything is working great.

I have had an employee come to me with a request to use a second public IP Address. How can I enable this second IP Address to be used by the Firebox ? Is there a way to add the IP Address to the current external interface? Or is it easier to configure one of the other interfaces as external and configure the IP Address on that port? If I do go the way of creating a second external interface, how would I route the traffic from that external interface to the internal interface properly? Sorry if this is a novice question, it has been several years since I have had to configure a firebox.

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