I have two routers, one wireless connected to ISP1 with optical cable, and the second one connected to ISP2. The second router is cisco 860 series, i will configure ACL lists and zone based firewall on it, so it need to be the router connected to the switch. How do i connect the two routers to share same network? Is internet from two providers going to be in a single network (speed up)? Do i need a third device to do this?

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Actually want to apply this architecture, i don't know if it is possible, Even with a load balancer i can't keep internet from two providers?

  • According to your question. I understood your topology. R1<--Net1-->ISP1 and R2<---Net2-->ISP2. "Is internet from two providers going to be in a single network"=>No, that is not possible. "so it need to be the router connected to the switch"=> where do you connect the swtich?? Im thinking this(omnisecu.com/images/tcpip/nat-overload-pat-topology.jpg) topology with 2 router and ISPs . Can you be more specific about your question. Jun 27, 2016 at 11:15
  • I commented by an answer so i could add a screenshot! Thank you
    – Dorasm
    Jun 27, 2016 at 11:35
  • 1
    You can do this, but you won't get additional bandwidth. You will either use one ISP or the other. Additionally, you need to decide what events would make you want to switch from one to the other.
    – Ron Trunk
    Jun 27, 2016 at 11:41
  • I want to use the cisco router to filter traffic.
    – Dorasm
    Jun 27, 2016 at 11:43
  • 2
    It may be possible to share the connections, so that PC0 uses one ISP and PC1 uses the other. This may cause some problems when multiple sessions to a web site are coming from different IP addresses.
    – Ron Trunk
    Jun 27, 2016 at 12:03

1 Answer 1


You can use a load balancer device. The load balancer will become your hosts' Gateway. The purpose of the load balacer is to route traffics (based on a selected algorithm) to the ISPs.

One powerful open source load balancer is Zen Loadbalancer. You can even install it on a Virtual Machine.

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