I have a Cisco 3640 Router with one Ethernet interface and two T1 lines. What i need is that i wanted to achieve Load Balancing. When one of my T1 goes down all the machines should be automatically routed through the other T1 so that the machines can browse the internet. I applied nating in Ethernet and the two Serial interfaces. I created two set of NAT pools and created standard access-list for the same.But inside machines are bounded only to the first T1 pool of ip address and not the second. Then I treid creating an extended access list permitting ip,icmp,tcp and udp for both Serial interface and gave ip access-group access list no out for both the serial interface. After this i can only ping to my serial interface not beyond, but the router is pining perfectly. Can any one guide me if it is possible and if so what needs to be done to correct the same.
Thanks in Advance