NAT Help for Overlapping networks

[Nick C.]

I have been researching this for a few days and still cannot get a simple NAT to work. We need to access a server but have overlapping IP's in our networks. Do I need "one-to-one" NAT statements? Does this require an ACL and or Route-map? 

Goal: NAT 4 IP's.

10.1.29.1 NAT 10.52.100.1   

10.1.29.2 NAT 10.52.100.2

10.1.29.3 NAT 10.52.100.3

10.1.29.4 NAT 10.52.100.4

Destination: 172.19.0.39

Router Interfaces:

Gig0/1.52 - Inside facing users on 10.1.29.0/24:  ip nat inside

Serial1/0 - Outside towards server: ip nat outside

Switch --> Router (NAT)  -->  MPLS Network  --> Server

10.1.29.1 --> 10.52.100.1 --> MPLS Network --> 172.19.0.39

Thank you!

[Jon Marshall · Accepted solution]

If you always to NAT those internal IPs to the same external IP - 

"ip nat inside source static 10.1.29.1 10.52.1.100" 

etc. for each IP address assuming none of the 10.52.x.x IPs are assigned to one of the interfaces on the router. 

Or you could just NAT all the 10.1.29.x IPs to the same 10.52.1.x IP and save a few IPs if the connection is always initiated from the 10.1.29.x side which it sounds like it is. 

Up to you. 

Jon

[Nick C.]

Hi Jon,
Thank you for the reply Jon. I found that I had my IP nat inside command on the wrong interface.
Have a great week ahead!
-Nick Chenault