Switching DNS server IPs

I'm planning to do a switch the IPs of DNS and Web servers. But we have resellers and other clients using their own DNS names and pointing them to existing IPs.

We want this change to be smooth and allow the Resellers as much time to update DNS IPs on their end.

So this is my plan, any advise or suggestion is much appreciated:

- Setup the new server

- Establish trust relationship between the two servers

- Lower TTL

- create a script that runs through each domain's named records and update it to the new IP addresses. (most likely will just use replace 1.x.x.x 2.x.x.x. -- /var/named/)

- Then we notify resellers to change their DNS IPs to point to the new server

- While they are doing that, all new visitors will be redirected to
the new server as we've updated the IP addresses on the old servers.

- Once resellers update their DNS IP addresses, we'll take the old DNS down.

I'm thinking this will provide hopefully the smoothest DNS/Web transfer. Am I missing something here ?

Thx!

 

 

 

 

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