[dns-operations] Test on Priming Behavior

[bert hubert]

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

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