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

[Hongyi Zhao]

Considering that the backend/forwarder IPs are always NOT owned by the
authoritive servers of the queryer.  It wil be difficult to ensure all of
them online all the time.  So, if we can let  the process run parallely and
then picked out the one which is retured firstly to the client.  At least
the query efficiency will be raised to some extent, IMO.

Regards

2015-02-23 18:49 GMT+08:00 Hongyi Zhao <hongyi.zhao at gmail.com>:

> Why not let the process run parallely and then picked out the one which is
> retured firstly to the client?
>
> Regards
>
> 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=203.0.113.210:5300;127.0.0.1,
>> powerdns.com=127.0.0.1;198.51.100.10:530
>> >
>> > 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
>



-- 
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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