Router NAT

Unanswered Question
Dec 28th, 2007

Hello all

we want to configure a dynamic NAT on a router.

The NAT must conserve the same last octet.

10.a.b.c nated to 20.a.b.c

Is it possible with IOS CISCO ?

Thanks for yours reply

I have this problem too.
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jine Fri, 12/28/2007 - 05:01


Ok for the Static NAT. But the problem is we have a lot of host (150). We will like a NAT automatic. Is it possible with a pool for exemple ? The objective is 10.a.b.c to 20.a.b.c for exemple

david.macia Fri, 12/28/2007 - 05:03


you can use static Nat or using a pool with the 20.a.b.c in dynamic NAT.

Merry Christmas

jine Fri, 12/28/2007 - 05:08

Ok but when I configure a pool, the NAT don't translate with the same IP adress last octet.

dmetheny1 Fri, 12/28/2007 - 06:32

A pool is just that - a group of IP's sitting in a bucket, waiting to be called upon. If you NEED, for example, to be translated to using Cisco NAT, you need to go with multiple static entries (as was mentioned by an earlier poster) rather than a pool.

jine Fri, 12/28/2007 - 07:25

Ok I found the command line

it's :

ip nat outside source static network /8

And that's work !


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