DMVPN (NAT?) solution with spokes with all the same subnets
I have a large number of remote networks that are spread all over the world. Currently they are all individual island with no connectivity to anywhere else.
What I would like to do is connect them all back to head office over the internet so I can remotely access them. The internet service I get from every site will be different and unknown e.g some directly on the internet, some behind NAT.
So I think the solution to this is DMVPN.
But my problem is that all of the remote sites have the same internal subnet. So how can I make sure they are all connected and the remote devices are all accessible at the same time?
I'm wondering if I can setup NAT on perhaps the Spoke router so that every device has a static nat with the Natted IP being unique. I have labbed this up in GNS3 and it seems to work. However the problem is that there are hundreds of devices at each site, which means a lot of NAT entries.
I'm wondering is it possible to do a full 1:1 Nat just specifying an entire network to network. E.g something like 192.168.20.0/24 NAT to 10.0.1.0/24 if try to access 192.168.20.5 it actually connects to 10.0.1.5
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