[Pdns-users] About the mechanism of forward-zones when using multiple ips for one zonename.

Hongyi Zhao hongyi.zhao at gmail.com
Mon Feb 23 10:49:50 UTC 2015

Why not let the process run parallely and then picked out the one which is
retured firstly to the client?


2015-02-23 18:28 GMT+08:00 Peter van Dijk <peter.van.dijk at powerdns.com>:

> Hello,
> On 23 Feb 2015, at 6:09 , Hongyi Zhao <hongyi.zhao at gmail.com> wrote:
> > forward-zones Comma separated list of ’zonename=IP’ pairs. Queries for
> zones listed here will be forwarded to the IP address listed. Since version
> 3.1.5, multiple IP addresses can be specified. Additionally, port numbers
> other than 53 can be configured.
> > Sample syntax: forward-zones=example.org=;,
> powerdns.com=;
> >
> > I just want to know the mechanism when we use multiple ip for Query a
> zone.  I mean is this process sequel or  parallel?  When we using multiple
> ip for resoving a specific domain-name, which answer given by the
> forwarders should be picked up by PowerDNS Recursor and then return it to
> user's client program?
> It’s best to assume the process is random. For any given query, the
> resulting data can come from any of the IPs, and there is no guarantee from
> which one. So, in general, make sure your backend IPs agree on the data!
> Kind regards,
> --
> Peter van Dijk
> Netherlabs Computer Consulting BV - http://www.netherlabs.nl/
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Hongyi Zhao <hongyi.zhao at gmail.com>
Xinjiang Technical Institute of Physics and Chemistry
Chinese Academy of Sciences
GnuPG DSA: 0xD108493
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