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