[dns-operations] Test on Priming Behavior

Davey Song songlinjian at gmail.com
Tue Dec 23 10:16:06 UTC 2014


Thanks for your comment, Mark.  Yes, I know it‘s OK, because the NS RRset
and Glue of root server rarely change.

But  I do not find any specification on the priming process of resolver, so
I do the test and post on the mailing list  hoping to discuss and find how
priming woks in implementations and what it should be.  If it is open and
do not need any specification, it's fine.  Or maybe there some problem done
in my test, I just want to check it.

On Tue, Dec 23, 2014 at 11:28 AM, Mark Andrews <marka at isc.org> wrote:

>
> In message <
> CAAObRXL2w+FZ2EhrBNCBnmOnJroNf0ffcTWDdJpQwYODv6DPtA at mail.gmail.com>
> , Davey Song writes:
> > Hi folks,
> >
> > 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?
> >
> > Regards,
> > Davey
>
> What risk?  If you are going to trust them to give you the root NS
> RRset you can trust them to give you a TLD referral.
>
> --
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org
>
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