DNS cluster

[Stelios A.]

Hi Brad,

I don't care about load balancing at the moment. I need to have 2 dns for
redundancy only.
If they query ns2 first and they don't find the subdomain that someone
might looking for then is it going to try to the other one, ns1 ?

Thanks

-----Original Message-----
From: Brad Knowles [mailto:brad at stop.mail-abuse.org]
Sent: Friday, July 08, 2005 9:16 AM
To: linux at climbincrete.com
Cc: bind-users at isc.org
Subject: RE: DNS cluster

At 9:02 AM +0100 2005-07-08, Stelios A. wrote:

>>   When somebody tries to access a domain, which of the dns will response
>>   first?
>
>>   Depends on which one the client queries first.
>
>  Fair enough but how do I know which dns they will query first?

	You don't.  Maybe they queried you in the past, and they have
some memory of which machine they think is faster.  Maybe they will
query the records in the order that they're handed out from the
delegating parent zone.  Maybe the servers in the delegating parent
zone do (or do not do) round-robin.

	There are too many variables.  It's impossible to tell which
server they will query first.

>                                                                  Is this
>  something that has to do with the country of the DNS?

	Nope.

>  The ns1 will be in UK and the ns2 in Netherlands.

	Getting network diversity is good, as is geographic diversity.
But that's probably not going to have a lot to do with load-balancing
between the machines.

-- 
Brad Knowles, <brad at stop.mail-abuse.org>



-- 
Stelios A.
www.climbincrete.com