How NAT works in this design?

Unanswered Question
Aug 27th, 2007

Hi forum,

we were given this network design in order to integrate with another company's network. Network A is our network running EIGRP, Network B is our partner's network running EIGRP as well.

R1(router) will policy route traffic that has been changed to to R2, and will policy route those conflicting IP address to R3 before going to R2.

How should I configure my DNS in this case? How NAT actually works in this case?

Thanks much,


I have this problem too.
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Pavel Bykov Tue, 08/28/2007 - 00:59

DNS in your network should point to translated addresses of the other network.

NAT works both ways in this example, so devices in one network communicate to OUTSIDE LOCAL address, which is translated afterwards to the OUTSIDE GLOBAL.

In your example:

Perspective 1:

NET1 = inside local

NET1 = outside local

NET2 = outside global

NET2 = inside global

Perspective 2 is reversed.

These two documents will help you understand the concept better:

Hope this helps.

Plese rate all helpful posts.


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