[dns-operations] Test on Priming Behavior

Davey Song songlinjian at gmail.com
Tue Dec 23 11:18:30 UTC 2014


 I guess that might because I don't wipe out the cache rightly. I use
"rec_control wipe-cache ."
 to wipe out the cache for root server. Does this will clear the cache rightly?

On Tue, Dec 23, 2014 at 3:38 PM, bert hubert <bert.hubert at netherlabs.nl>
wrote:

> On Tue, Dec 23, 2014 at 11:08:39AM +0800, Davey Song wrote:
> > I am doing a test on priming exchange from different DNS software’s and
> > find something weird. BIND(v9.8.1, v9.9.4, v9.10.1 ) would send NS query
> > and a query simultaneously rather than wait until NS query get answered.
> > PowerDNS(v3.3) will not do any NS query but query base on the content in
> > hint file when root-hint is configured. Does anyone know any
> consideration
> > or risk of these implementation?
>
> Davey,
>
> As far as I know, that isn't what we do:
>
> Dec 23 08:36:41 .: Resolved '.' NS d.root-servers.net. to: 199.7.91.13
> Dec 23 08:36:41 .: Trying IP 199.7.91.13:53, asking '.|NS'
> Dec 23 08:36:41 .: Got 28 answers from d.root-servers.net. (199.7.91.13),
> rcode=0 (No Error), aa=1, in 127ms
>
> We pick the initial 'hint' of root IP addresses from either a hints file
> or a baked in hints array.
>
>         Bert
>
> --
> PowerDNS Website: http://www.powerdns.com/
> Contact us by phone on +31-15-7850372
>
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