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translation for Outside Global addresses

Unanswered Question
Apr 10th, 2006
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Hi, Messrs!

I would like to know, how can I do a translation for Outside Global addresses for one IP address and that comes from a specific interface serial (example serial 3/5)?

I would like to translate destination ip to, but only

for packets comes from serial 3/5.

I can´t do the translation for outside global addresses in other interfaces


What wrong with that cfg?

interface FastEthernet0/0

ip address

ip nat inside


interface Serial3/5

ip address

ip nat outside


ip nat pool PROBLEMA netmask

ip nat inside source list 50 pool PROBLEMA

access-list 50 permit

thanks in advance,


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sundar.palaniappan Mon, 04/10/2006 - 10:32
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You don't need a nat pool if you are doing just static NAT. All you need is a static nat entry (see below) for transalating your global address of to inside address of Remove all but the interface nat commands and add the static nat noted below.

ip nat inside source static

Pls. rate all helpful posts.



conectividade Mon, 04/10/2006 - 11:01
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but when I did it, I have had another problem.

Please look the attached file.

Ther return to other ip client when that try to connect with, does not work.

Because the router translate ip server, in the return of connection.


sundar.palaniappan Mon, 04/10/2006 - 16:02
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May be I am not following something here.

To clear things up.

Global IP:

Local IP: is a host connected to E0/0 on your inside network. Users on the outside of s3/5 will try to get to the server using IP of and it should be transalated to

But there are other users on other serial interfaces, which are configured as nat outisde interfaces, they will try to get to using it's local IP and you want that to work as well.

If I understood your requirement incorrectly and then let me know what and where.


conectividade Tue, 04/11/2006 - 06:10
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please look this new file attached. This file have a example of our conections, where we have 3 clients, but the client-3 can not connect with server and can not do a NAT in their router.

So we need to do this NAT of to

I hope you understand me.




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