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Public IP blocks on cisco router

I have a block of 8 IP's from my ISP. I need another block of 8. How on a cisco router do I add the 8 additional IP's to the same Interface?
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Don JohnstonInstructorCommented:
Well, if you have a block of 8 IP addresses, you don't necessarily have those 8 IP addresses assigned to the router.  

Most likely, you have NAT statements that translate inside addresses to those addresses in the block.

You would have to provide additional information. Posting a sanitized router config would help.
sicmAuthor Commented:
Thanks for the response.

Basically what I have is a block of 8 IP's from my ISP all in a subnet. One of them is assigned to the Router interface and one is assigned to the outside face of my firewall. The rest are natted to internal applications. I need more. So my question is if I buy an additional subnet from my ISP with 16 public IP's in a different subnet how could I add them to the router? Do i have to rip and replace the subnet that currently exists or can you somehow add both blocks of IP's to the same interface?

Hope that helps clear up the question.
Don JohnstonInstructorCommented:
You'll simply add NAT statements for the additional addresses.
Maybe you can do secondary interface, like this.

router(config-if)#ip address
router(config-if)#ip address secondary
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