How relevant is the ISP in DNS performance?

[Michael Kjorling]

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Wrong. In the unlikely case that both servers answers equally quick
from anywhere on the Internet (this does not sound like a reasonable
assumption, but we'll start there) the primary will get 50% of the
queries, and the secondary the other half. Actually, the new terms
'master' and 'slave' are better, since it really only has to do with
zone propagation - it has nothing to do with whether one name server
is preferred over another.

Now, obviously not everyone is going to have the exact same RTT to the
two servers. Over time, one will be favored by some clients, while
others will prefer the other one. This depends on which server answers
the fastest.

Think of "master" and "slave" instead of "primary" and "secondary",
and this may become more clear to you.


Michael Kjörling


On Sep 27 2001 16:30 +0200, Nico De Ranter wrote:

> Now, if I'm correct this means all dns queries will arrive on my primary
> except if the primary is off-line then the secondary will take over.
>
> Nico

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