I've not had to deal with a NAT issue (luck I guess). I have 2 routers connected by their WAN serial cables, one site (local config) has 3 subnets 192.168.10.x/24, 192.168.20.x/24, 192.168.30.x/24, the router is providing the local routing to the L2 2960 switches (router on a stick etc). This router connects to a remote route via it's serial cable but the remote site also uses 192.168.10.x/24 for it's LAN and we both need to share our servers across the WAN. I need some help to hide/NAt this range and allow communication between sites. I did ask if we could change the remote sites IP range but we can't (long story).
I have attached the configs in hope somebody can give me an example. I did make start by adding the "ip nat inside" and "ip nat outside " commands then I got a little lost.