I am trying to nat with site-to-site Tunnels on IOS routers with overlapping private ip addresses. On the PIX/ASA it is rather easy.
static (Inside,Outside) 10.99.0.0 access-list 102
access-list 102 extended permit ip 10.1.0.0 255.255.0.0 host (public ip of other end of tunnel)
Your tunnel configuration is a given on both.
I have tried a command I found in a book trying with a route-map but does not work. 'ip nat inside source static 192.168.1.0 255.255.255.0 10.99.1.0 255.255.255.0 route-map AGVsoft no-alias
and then the route-map. The routers are running advanced ip services, one is a 2811(12.4.11T) and the other is a 871(12.4.4T).
I have been unable to find a solution on the net/Cisco anywhere other than the Cisco Security Manager.