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I am considering a caching/forwarding nameserver to be used by internal servers to speed up name resolving.

Is there a way to calculate some reference values to figure out its requirements? I simply took the average size of a zone file and made a projection up to an estimated number of zones to get an average size in mb. But I am not sure if I can take that result as a reference.

How would you do this?

Clarification / More info: Currently, there are 3 SMTP Servers and 1 Webapp which do DNS-Lookups, two of the SMTP relays are used for mass-mailing. They will most likely get between one and three more smtp relays.

The specs I am targetting at is mainly RAM.

pdu
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My phone can likely handle this - seriously. DNS is quite efficient and do not forget that the servers behind the server also cache a little.

So, a small virtual machine should be enough. Add a gig of memory or two and you are fine. I would not run that on physical hardware.

TomTom
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