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IOS-how to access internal server by public address in inside network

Hi Everyone - I've got a real challenge.

I have a 877 Router with 3 Interfaces

- Inside (

- DMZ (

- Outside (212.212.x.x)

I have natt'ed Ports on different DMZ servers to the "outside" interface on the router. The servers can be reached from the internet using the public ip and the ports i configured.

So far so good.

The huge challenge is that we should also be able to reach the Servers in DMZ from the inside LAN using the "Outside" IP address. (Remark: No DNS Doctoring - only based on IP Address).

Ive been trying with "ip nat enable" (but i have very little experience with ip nat enable) on the interfaces, different variations of "ip nat inside" and "ip nat outside".

Ive tried many variations of

- "ip nat outside source static"

- "ip nat inside source static"

- "ip nat inside destination"

Ive even considered Route-map with nexthop = ip address of the server in DMZ, but i believe this would require some reconfiguration of the Unix machine .

Ive seen some other simular posts here, for ASA, which has been solved, and hope that someone knows a solution for this as well.

Best Regards