Load balancing question

Michael Kjorling michael at kjorling.com
Tue Oct 9 21:28:48 UTC 2001

Hash: SHA1

I think this qualifies as a FAQ by now, if it isn't already. :-) BIND,
and hopefully other DNS servers as well, will start out by randomly
querying authorative servers, but after a while be able to pinpoint
which one responds more quickly.

So, if you've got one authorative server in Chicago, one in Europe,
one in Australia and one in Canada (just to mention a few examples),
and you yourself are in Chicago, it is very likely that the Chicago
server will be the fastest one to respond (round-trip-time-wise), and
so it will be preferred over the others. Every now and then, the
others will be tried to see if they have become any faster. (At least
this is the case with the root servers, and I don't belive they are an

Michael Kjörling

On Oct 9 2001 15:23 -0400, Andre DeIuri wrote:

> Hello,
> I was wondering if bind performs any load balancing. Example: would a
> caching server located in Chicago looking for a record for my domain
> (us.telia.net) be directed to my Chicago auth server, or would be randomly
> sent to any four of my authoritative servers?

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Michael Kjörling  --  Programmer/Network administrator  ^..^
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