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Public IP blocks on cisco router

Posted on 2012-03-28
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Last Modified: 2012-06-27
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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Question by:sicm
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Expert Comment

by:Don Johnston
ID: 37779676
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.
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by:sicm
ID: 37779934
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.
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Expert Comment

by:Don Johnston
ID: 37780130
You'll simply add NAT statements for the additional addresses.
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klassa earned 2000 total points
ID: 37780437
Maybe you can do secondary interface, like this.

router(config-if)#ip address 192.168.1.254 255.255.255.248
router(config-if)#ip address 172.16.19.254 255.255.255.248 secondary
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