I'm upgrading our network envirnment in the next few months to include a redudant Internet connection. This change is requireing that our ISP switch us from a /30 to a /29. Currently the 3845 router I have in the /30 subnet is the DMVPN hub for our 8 remote teleworkers that have 881 routers in their home offices.
The prepare for this IP address change, my thoughts were to create a new GRE tunnel interface with the new DMVPN hub settings before the IP address change takes place. Once we switch to the /29, the spoke routers should be able to reconnect to our network under the new tunnel interface. We are running EIGRP over our DMVPN, so all routes should change to the new tunnel interface ones the tunnels is up.
They are resubnetting because they are going to configure HSRP on their end, so it is completely changing. I also realized I will have to change the GRE tunnel subnet since the routers won't let me overlap the IP address on the tunnel interfaces.
I have 8 routers all in different locations that are connecting to the hub. I guess I could just make some minor modifications to the current tunnels , but I would have to walk non-techinical people to do that over the phone. That would create more down time for the users, so I am trying to do more work behind the scenes.
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