NAT overload problem

Unanswered Question
Jan 20th, 2009


I want to Translate all my internal addresses on my WAN cisco's address.

I have followed NAT overload configuration sample in Cisco documentation, but that doesn't work.

No translations are perfomed for my internal adresses.

Could you help me ?

I have this problem too.
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jonathanaxford Tue, 01/20/2009 - 05:28

Hello there,

It looks like you need to add the IP nat outside and IP nat inside commands to the relevant interfaces...

interface vlan 1

ip nat inside

interface fa0/4

ip nat outside

Give that a try and see what happens...



garnier.1972 Tue, 01/20/2009 - 05:41

I've added this two statements on my conf (shame on me) but that's doesn't work too.

I've performed a "clear IP nat translation *" an restart a ping from my internal network to a WAN address but that's doesn't work.

I've attached new conf.

Tshi M Tue, 01/20/2009 - 06:46

Your config should work but try this as well:

ip nat pool test netmask

no ip nat inside source list 100 interface FastEthernet4 overload

ip nat inside source list 100 pool test overload


garnier.1972 Tue, 01/20/2009 - 07:37

That doesn't work too

But with "no ip cef" in configuration that's work (eiter with interface overload or pool overload) !!!

Why ?

lejoe.thomas Tue, 01/20/2009 - 05:35

Hi Garnier,

Please add the following

You need specify nat inside and nat outside interfaces.

int fastethernet4

ip nat outside

int vlan1

ip nat inside



armingojak Tue, 01/20/2009 - 05:36

try put "ip nat outside" on WAN interface, and "ip nat inside" on LAN interface...


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