How to change the public IP on a 827-4v router

Unanswered Question
Aug 5th, 2010

In my company have recently changed internet service provider and the IP has changed. We have two centers, and each has a 827-4V Cisco router and have a VPN between two routers.
Please I need a detailed guide on how to change the public IP routers to the VPN still works.
Thank you.

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Nagaraja Thanthry Thu, 08/05/2010 - 20:00

Hello,

Here is the link that explains the configurations of 827 router interfaces.

http://www.cisco.com/en/US/docs/routers/access/800/801/software/configuration/guide/routconf.html#wp1015102

If you have the VPN between the two devices, then make sure that you change the remote peer address to the new address of the remote router so that yur VPN comes back up once all changes are made.

Hope this helps.

Regards,

NT

mbroberson1 Fri, 08/06/2010 - 19:23

Hi Paco,

On the routers where you need to change the ip address, change them on the outside ISP facing router interface. Next for the VPN change the "set peer" address for the vpn's on each router under their respected crypto map entries. Next if you are doing "pre-share" keys for the vpns then change the public ip address onm each router to reflect that, you will be using the same key..just replacing the public ip address of each router which is also the same as the adjacent "set peer" address.

HTH,

Brandon

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