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Add a Second IP Address Block to Interface on Cisco Router

by Jon on November 23rd, 2009

I recently had to add a second ip block to a clients cisco router and I found it was a lot easier than I expected. It was really only one change in the configuration. Here is how to do it.

Login to the cisco router and get into enable mode, once in here go to the interface you would like to configure with the following:

router1(config)# interface ethernet 0
router1(config-if)# ip address 10.10.10.2 255.255.255.0 secondary
router1(config-if)# exit
router1(config)# write

And now add another device to your network and see if you can use this new range of static ip addresses. This is very useful for adding new public ip blocks to a cisco router. Do a “show running-config” to see what ip address you have assigned to your interfaces.

From → Cisco

One Comment
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