Someone told me that to set up a DMVPN, I will need a static IP. That is fine, we will get a static IP. But he says that the hub router (where we need the static IP) can be behind another router that serves as the gateway to the internet. I have trouble believing that. How will the spoke routers reach out to the hub router to make a connection, when they try to set up the tunnels? They will be programmed with the static IP, which will be the IP of an interface on the hub router, but that won't be on the internet. And the router between the internet and the hub router will have a dynamic IP address. Also, the hub won't be able to reach out and make a connection to the spoke routers, because they won't have static IP's. So I am puzzled by this. Do the hub and spokes have software to reach out to a central location, which will make sure they all get connected? I don't see how that would work.
