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Load balancing between two interfaces on 2811


We have a 2811 router with VPN and NAT configured. We have two internet connection from different ISPs. The speed of our original connection is 2MB up and down. The speed of our new connection is 1MB up and down. We want to configure load balancing between the two connections. Our new ISP has provided us with a CISCO 837 router. We want to connect that router into our 2811 on one of the free WIC card and then configure load balancing between the two interfaces on our 2811. The third interface has a local address configured. Please suggest where to start. I tried searching on net for any configuration example but I was unable to find any particular example with commands. I am new on CISCO platform. Any help will be hugely appreciated. Thanks in advance.