DNS management techniques

We're running a small web hosting business and I'm contemplating on adding more web servers. Right now, we have two web servers: one is running Windows NT4 (yes, it's very old) and the other one is running RedHat Linux using Ensim's WEBppliance. If I add another WEBppliance box, clients using that will be using the IP address of that box as their primary DNS. This is going to be a problem if we'll be adding 3 or 5 boxes!

Is there a system that hosting providers use to centralize and automate client domain management?

 

 

 

 

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