Dual ISP Config

[Dustin Barnett]

Network newbie here, working on a home project.

I have an old Cisco 2600 router running IOS 12.4 with 4 ethernet ports  available. The goal is to put this router in front of a firewall and  have it split traffic between 2 ISPs based on access lists. For example  all traffic on port 25 goes through ISP 1 and the rest of the traffic  goes through ISP 2.

The firewall would only be configured with a single gateway.

What is the best way to go about this? I was thinking a NAT config, but not sure.

[Islam Nadim · Accepted solution]

You have to go with Route Maps and/or PBR ..

Can you share your current topology and config?

[Abzal · Accepted solution]

Hi,

As Islam mentioned you need to use PBR.

Here is the link with excellent example

https://supportforums.cisco.com/docs/DOC-8313

Hope it will help.

Best regards,
Abzal

[Islam Nadim]

WOW!! I'm astonished how people here complete each other!

[Dustin Barnett]

Thank you, that is an excellent post. I have succesfully configured a PBR in a lab environment.