Query regarding NS record

babu dheen babudheen at yahoo.co.in
Sat Sep 17 09:57:13 UTC 2011


Got your concern. Will change my setting accordingly. Thanks for your advise.
 
Regards
Babu

From: Kevin Oberman <kob6558 at gmail.com>
To: babu dheen <babudheen at yahoo.co.in>
Cc: Florian CROUZAT <gentoo at floriancrouzat.net>; "bind-users at lists.isc.org" <bind-users at lists.isc.org>
Sent: Saturday, 17 September 2011 9:26 AM
Subject: Re: Query regarding NS record

On Fri, Sep 16, 2011 at 6:57 PM, babu dheen <babudheen at yahoo.co.in> wrote:
> So when multiple DNS records are available, is it possible to direct all DNS
> queries to first (NS) record always? meaning,
>
>  mail.myoffice.com    IN    NS    20.20.20.20
> mail.myoffice.com    IN    NS    30.30.30.30
>
>  In the above, is it possible to direct all DNS queries only to 20.20.20.20
> and if this fails, is it possible to direct dns queries to next NS
> server(30.30.30.30)?

I'm not aware of a direct way to do this, but you could do by adding the
address listed in the NS record for the backup server to its interface only
when the primary stops responding. The backup would need to send a
regular query to the primary to know when to add the address.

I really don't understand why you would want to do this.It mostly complicates
things and reduces robustness. A key in the operation of DNS is to have multiple
servers, all answering and all having identical data for queries from
any particular
source.

Kevin Oberman
Network Engineer -- Retired
kob6558 at gmail.com
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