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Failover server and DNS cache

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I'm not a network person, so forgive me if this is a naive question.

Suppose we have an internal (intranet) web application, and 3DNS is configured to provide the IP for a secondary server if the primary server fails to respond.

Now suppose a user (IE 6 w/ Win XP or 2000) is accessing the application when the primary server fails. Even if 3DNS is providing the IP of the secondary server, it appears that users' DNS cache continues to direct them to the primary server.

We're being told that these users need to close IE and re-launch in order to clear that cache. What would be required to make failover transparent to these users?
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