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Failover routing design for Internet/proxy servers

We have two offices each with a local Internet connection and a ISA proxy server. I want to come up with a way so if one of the servers/ISP is down that Internet traffic requests can be automatically be sent to the other offices proxy server. We have all Cisco routers (2821) and Cisco switches (3750's)

The proxy servers use two NIC's, one for Internal networks and the second for DMZ (connected to PIX). We then put route commands on the ISA server to route internal traffic through there. If anyone has a better design or recommendations I'm all ears.

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Re: Failover routing design for Internet/proxy servers

Go through this Configuration Examples and TechNotes documents you will get more idea for load balancing and failover.

http://www.cisco.com/en/US/products/ps5854/prod_configuration_examples_list.html

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