In the example I have on both side the same /24 network.
In my example I habe one one side a /22 network that includes 4 of my /24 networks on the other side.
So my thinking was, that I only need to NAT the side with the /22 network from 192.168.12.0/22 to 172.21.8.0/22. The other sides gets only traffic from the network 172.21.8.0/22 and routes this network through the VPN tunnel and everything is fine.
It can work that way, can't it?
Kind regards
Andy