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Routing to two ISPs using one router

I have a design issue.  I need to route traffic to two different ISPs using one router.  We have two ISPs and I need to route important traffic over one and recreational traffic over the other.  My thoughts were to have an 1811 router connected to the two ISPs and then an 5510 ASA behind that connected to my core routers and then my core switch.  So it would be like this ISP---1811---5510---2921---switch.  I have public IPs assigned to me by each ISP.  My 5510 ASA is doing the NAT for me right now between my LAN and the Internet and I planned to leave it like that however if I do then I am not sure about what subnet to use in between my router and ASA.  I also planned to use policy based routing on the 1811 to route the traffic to the two different ISPs. Any thoughts ? Am I approaching this the right way ?

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Routing to two ISPs using one router

Its better to use private ip accessing between the router and ASA and let the router do the nat per ISP link

For traffic routing you can use PBR with ip sla

Pleaser refer to the below link where you can find all the details also pay attention to the nat config with two different ISP links

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

Hope this help

If helpful rate

New Member

Routing to two ISPs using one router

Thanks for your help ! I will try to implement that solution and make any changes as needed.

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