Two outgoing queries for each incoming query

[Mark Andrews]

In message <200903121454.n2CEsvEl019250 at metis.hicks-net.net>, Gregory Hicks wri
tes:
> 
> > Date: Thu, 12 Mar 2009 13:43:44 +0200
> > Subject: Two outgoing queries for each incoming query
> > From: My Name <mylistuser1234 at gmail.com>
> > To: bind-users at lists.isc.org
> > 
> > Is this possible with 9.6.0-P1 or do I need to change the code (all
> > ideas where to start are welcome, I haven't looked at the code yet).
> >
> > I want to setup a forwarder and each incoming query (in fact only A
> > or AAAA) should be sent to two different upstream servers.
> 
> Why?  Bind already does this.  If there are two (or more) servers
> serving a zone, it will already query all of them for the initial
> query.  However, it uses the answer from the server that has the
> fastest response time.

	No.  It will query multiple servers in turn as needed to
	satisfy queries.  RTT estimates are most effective with
	infrastructure zones as those are the ones queried most
	often.  Named tries to minimize the number of queries it
	makes.
 
> Regards,
> Gregory Hicks
> ---------------------------------------------------------------------
> Gregory Hicks                           | Principal Systems Engineer
>                                         | Direct:   408.569.7928
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org