Some questions about bind

Brent Bolin brentbolin at hotmail.com
Tue May 4 14:07:35 UTC 2004


Barry Margolin <barmar at alum.mit.edu> wrote in message news:<c76848$1gfs$1 at sf1.isc.org>...
> In article <c76115$17dd$1 at sf1.isc.org>,
>  brentbolin at hotmail.com (Brent Bolin) wrote:
> 
> > Hello All,
> > 
> > 1. When a domain has miltiple name servers listed(whois) what name
> > server does it use.  Does it do round-robin or does it use the first
> > listed name server ?
> 
> Client servers keep track of the response times of the servers, and use 
> the one with the best times.  If there are several servers with similar 
> response times, they'll be chosen essentially randomly.
> 
> The order of the nameserver listing is irrelevant.  The only records 
> that impose any kind of priority ordering are the ones that have an 
> explicit priority value in the record, e.g. MX records.
> 
> > 2. If someone is trying to get to a name address and the first name
> > server does not have it listed will bind try the next authoritative
> > name server for that domain or does it stop at the first name server ?
> 
> Failover only occurs when a server doesn't respond.  As long as the 
> server responds authoritatively, its answer will be used.  If it says 
> the name doesn't exist, it will be believed.


tku for your response


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