Cisco 837 - how to set up Inside to Inside NAT for DNS resolution?

We are taking away the ports, that is correct, but we are adding IP instead, hence everything. The trick here is to get you to clear your NAT cfg, and start over with the extendable keyword. If this works, My next sugguestion is that you do what you have now, but with the extendable keyword in the end of every line. and then take away the IP line.

you follow ?

I think so yes. But at some stage I will need other port-redicrection to go to a different server, so I need to keep it as port-specific.