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You can have more than one DNS server active at once, but you need to make sure you setup the old one as a slave to the new one. If you don't do that, when you make changes to the new server, the old one won't pick up the changes and it will still give out old information when it's queried. If you leave that server listed with your domain name registrar, it will still be getting queries.
You should give more than a week to make the change, and about a week prior to switching over, lower the TTL on all your records to a few minutes. That way when you make the changes very few sites should have your information cached and thus will do new lookups very soon after you switch servers.
Last edited by chort; 12-26-2006 at 02:28 AM.
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