Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

NAT overload

Hi there,

I know we can translate multiple inside IP's to single IP by configuring PAT,

Is it possile to NAT multiple outside IP's into single IP?

Many thanks,

Raj

8 REPLIES
Hall of Fame Super Blue

Re: NAT overload

Raj

On a router no. You can translate multiple outside IP's to a range of inside IP's but not just one as there is no "overload" keyword option when doing "ip nat outside ..."

On a Pix/ASA yes this is very easy to do.

Jon

Re: NAT overload

Hi

[Edit]

Sorry, Jon is right, I missed the no overload option.

You can do this.

By doing ip nat inside source list x interface x overload for example, you are doing source address translation. You need to do destination address translation using the ip nat outside command:-

ip nat outside source list x pool x

If oyu only define a single IP address in your pool, then you have got what you need.

IP NAT outside config guide.

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_configuration_example09186a0080093f8e.shtml

Hall of Fame Super Blue

Re: NAT overload

Adam

Must admit i have never understood why this functionality is not available on a router.

I have used this functionality on a Pix/Asa quite a few times and it can be quite handy in certain cases.

Perhaps i should just submit a feature request :-)

Jon

New Member

Re: NAT overload

Hi,

What would be the command on PIX/ASA to overload outside NAT ?

Raj.

Hall of Fame Super Blue

Re: NAT overload

Lets say you wanted to translate all outside addresses with a source of 192.168.5.0/24 to 172.16.10.1 on the inside

nat (outside) 1 192.168.5.0 255.255.255.0 outside

global (inside) 1 172.16.10.1

Jon

New Member

Re: NAT overload

Jon,

Thanks for the response

Is this works along with inside IP translation as well, I mean both way translation concurrently.

nat (inside) 1 0 0

global (outside) 192.168.6.1

Thanks,

Raj

Hall of Fame Super Blue

Re: NAT overload

Raj

Yes it should do but to be on the safe use a different NAT id ie.

nat (outside) 2 ...

global (inside) 2

Jon

New Member

Re: NAT overload

Jon,

it works , thanks

Raj

375
Views
5
Helpful
8
Replies