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Nathan KaufmanFlag for United States of America

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Moving servers from Co-Lo and want DNS to keep active when changing IP addresses

We are moving servers that host websites from a different provider to our data center.  We will be changing the IP addresses of the hosted websites and want to know the best way to keep the DNS updated with minimal downtime during the transition.  

Amazon Route 53 is the option of choice for managing our DNS.  We mainly want to know if using an option like an Weighted record or Failover record is a good option or do we just need to add the new IP address to the A record?
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Change the TTL on your current A records to a small amount of time, when you do the move change your A records to the new IP and the amount of downtime will be your TTL.
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The concern I have is that it takes time for the Name Servers to populate to other Name Servers, so it won't reflect the change on all Name Servers globally.  I want the best solution for it to already be populated in other Name Servers, so the reason for doing this is to make sure the site is accessible on a global scale, not just our Name Server.
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Shalom Carmel
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Thanks everyone for your help.  I will do the TTL update as mentioned a few days before our move to make sure it gets to all other NS.  Thanks again!