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NAT Help for Overlapping networks

Nick C.
Level 1
Level 1

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!

1 Accepted Solution

Accepted Solutions

Jon Marshall
Hall of Fame
Hall of Fame

 

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

View solution in original post

2 Replies 2

Jon Marshall
Hall of Fame
Hall of Fame

 

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

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
Review Cisco Networking for a $25 gift card