Network Address Translation

[mumomutisya]

Greetings,

I would like to NAT outgoing traffic only from a subnet ID 192.168.88.0/24 to a subnet ID 172.20.30.0/24 BUT only for traffic heading towards two partner subnets (10.20.40.0/24 and 172.20.95.0/24) without affecting outgoing traffic to other partners. How can I configure this? The device is an ISR 3800 series. 

Thank you in advance. 

[paul driver]

Hello

Are you using single or multiple egress interfaces for nat?

[mumomutisya]

Multiple interfaces. Traffic to each partner network goes out through a
different sub interface

[Georg Pauwen · Accepted solution]

Hello,

your best option is probably to use policy routing and route maps. Post the full running configuration of your router, so we can fill in the bits and pieces...

[mumomutisya]

Greetings Georg,

Thanks went with your proposal it worked. 

Regards 

[koushalmru]

Hello,

On the ISR 3800 series Router create:

1. An extended access-list with source (192.168.88.0/24) and destination (10.20.40.0/24 and 172.20.95.0/24)
2. Create a nat pool for subnet 172.20.30.0/24
3. Apply command ip nat inside on the interface from where the traffic is originating
4. Apply command ip nat outside on the exit interface
5. Apply final command ip nat inside source list <access-list created at Step1> pool <nat pool created at Step2> overload

Thanks to advise if all OK.

Regards,

[mumomutisya]

Hi Koushaldev,

Thanks for the response, I found a way out with Georg's suggestion.

Regards