Routing – connecting two routers, each connected to a different ISP

Architectureisprouterroutingsubnet

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?

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?

Best Answer

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.

Related Solutions

Cisco – Load balancing with multiple ISP, two routers and firewall

You could configure a floating static route. This is a method in which two default routes are configured one with a higher AD than the other so that when one link goes down the route would be removed and the backup inserted to take over. For this to work the 2901's would have to be plugged directly into the firewall to detect the link is down and therefor remove the primary route from the routing table.

route outside 0.0.0.0 0.0.0.0 192.168.1.1 1
route outsidebackup 0.0.0.0 0.0.0.0 192.168.2.1 2

P.S. In the question you say you use a 5505 and a 5515, which one is it? The only reason I ask is that the 5505 can have some limitations when it comes to named interfaces.

Routing – Connecting one public ip address independently to two private ip networks with full port availabilty on both

If you only need to direct http/https connections to different web servers, then you need a reverse-proxy.

install and configure your reverse-proxy inside your network
make sure your reverse-proxy can contact all your internal networks
redirect the public 80 port to the reverse-proxy
and voilà, you can reach several different web servers from the outside

If you need to share other ports, then you have to find a way to decide why each packet must go in which network. In most case this is very difficult and require to write your own reverse-proxy.

Best Answer

Related Solutions

Cisco – Load balancing with multiple ISP, two routers and firewall

Routing – Connecting one public ip address independently to two private ip networks with full port availabilty on both

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