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That's how things would work, however you need a proper load balancer that will distribute the traffic to both systems. Then if host "A" goes down, the load balancer notices this and sends the traffic to only host "B" until host "A" comes back.
So in your case you may just have round-robin DNS setup which doesnt have any kind of error detection so it wont automatically switch that traffic for you.
If you need more information hit me up on icq at 36837470.
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Take Luck!
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