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DNS configuration procedures for moving servers from 1 IP block to another

Posted on 2008-06-24
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Last Modified: 2013-11-30
Hi!

My servers hosted at a colo.  Our servers are behind a Cisco ASA 5510.  The ASA redirects Internet traffic to corresponding internal IP addresses.  The colo has assigned a new IP block to me so I need to change the firewall and DNS to reflect the new IP block.  My main concern is DNS resolution since the DNS entries will be updated to the new IP blocks and am afraid that visitors will be directed to the old IP if they have cached the old DNS records.  Kindly provide procedures on how to eliminate any downtime.  Greatly appreciated!
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Question by:dangel
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craigothy earned 250 total points
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What you will want to do is contact whoever is doing your DNS hosting and have them lower the TTL (time to live) for your zone to something like 5 minutes.  That way whoever does a lookup of your hosts will only cache that information for 5 minutes.  Whenever you do the change, then ideally you will only have about 5 minutes of downtime at the most.  Hope that helps.
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