NAT rules

[asbesi001]

Hi,

I have a question regarding NAT.
Is it possible to apply two NAT rules, if yes, will it increase CPU utilization, have you applied in real traffic?
My scenario is simple. I have two ISP connections, and I want using nat to route traffic for a particular subnet through first isp, and other subnet through second isp.

For example:

!
ip nat inside source list 10 interface FastEthernet0/0 overload
ip nat inside source list 20 interface FastEthernet0/1 overload
!
access-list 10 permit ip host 192.168.10.100 any
access-list 10 deny ip any any
!
access-list 20 deny ip host 192.168.10.100 any
access-list 20 permit ip 192.168.10.0 0.0.0.255 any
access-list 20 deny ip any any
!

Hope it is clear!

Regards,
Brj

[Vasilii Mikhailovskii]

Hello.

This won't work, as you need to make routing first.

In your case, I would suggest to read http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/100658-ios-nat-load-balancing-2isp.html

Instead of load-balance (like on the article) you need to run PBR on inside interface.

[asbesi001]

Hi Vasilii,

Thnx for the reply!

PBR has a quite big impact on CPU, and it's not my preferred way. Is there any way to achieve this?

Regards,

-brj.

[Vasilii Mikhailovskii]

Hello.

Please share the details of your hardware and link bandwidth, so we could estimate the impact.

Could you please clarify what is the business driver for your case?