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Using clusters to manage gateways

I have a network of about 40 Linux workstations which access the Internet via two T1 connections. Is there some way to configure them so if one gateway goes down, they will automatically switch to the other gateway?
Configure two clusters into one virtual box, and share one IP address. You'll need to use dynamic routing on the client. Many networking products have failover capabilities built into them. Using software is the more effective way to solve the problem, because you don't have to worry about reconfiguring clients correctly to deal with the redundancy. Point them all at your one gateway IP, and let the router software do the work.

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