Quinn Comendant wrote:
I asked the techs at Rackspace (where we have our qmail toaster) how to, and if
they would recommend, setting up a caching name server. They replied to the
contrary:
Are they nuts? (They are sometimes.) But they have local-cachine nameservers they provide, which, from my server, have ping latencies from 0.1-0.2 ms.
No, they're actually right. If all (or a good majority) of their
clients are pointed at their caching name servers you get the benefit of
everyone else's previously cached queries. If you install a local
caching server you only get the benefit of caching your previous queries
alone. Technically you could configure Rackspace's caching servers as
forwarders in your local Bind instance; that way you have the benefit
of not having to go out to the root DNS servers to resolve the queries
yourself. It's questionable, however, whether the benefits of a local
cache would outweigh the performance hit from running a local caching
server.
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