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Load Balance ISPs with PIX

We have 2 Internet connections, T1 lines, one to a 1841 router and one to a 2811 router each having their own LAN block. One T1 includes Voice on the circuit, so the lines cannot be multi-linked. These routers feed another 2811 with a 4 port WIC module, that feeds a PIX 501. This router is performing NAT from the two Public IP ranges to a 172.16.1.x range that is configured on the outside of the PIX. I have followed the load-balancing examples, and the Internet access would load balance, but we could not use both Public IP ranges. In order to both IP ranges, I had to add a route-map for the second Public range, but this broke the load-balancing. Is there a way to do both and have the Cisco VPN to the PIx work correctly?

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