ANY queries, in my *limited* experience, have had higher latencies by an order or two of magnitude. but that was mostly when I was doing open resolver research a year or two ago. On Jun 10, 2012 7:25 AM, "DTNX Postmaster" <postmas...@dtnx.net> wrote:
> On Jun 10, 2012, at 12:33, Dobbins, Roland wrote: > > > On Jun 10, 2012, at 5:29 PM, <sth...@nethelp.no> wrote: > > > >> One word: qmail. Google "qmail dns any query". > > > > If that's it, then would asking djb to change its behavior so as to > issue TXT requests to look for SPF records make sense? > > > > I know that doesn't do anything for currently-deployed MTAs, but one has > to start somewhere . . . > > Asking DJB to change qmail behavior? ;-) > > It's not just qmail, though. I bet there's some engineers who consider > it more efficient to do a single query to get all the data they want. A > lot of the 'ANY' queries we get originate at Google, HE etcetera. > > Google is known to be obsessed with latency, for example, so I wouldn't > be suprised if they deliberately request ANY and then parse and cache > the results for a multitude of uses. > > A single ANY query for a domain gives you the NS, MX, TXT and SPF > records, plus any A/AAAA record present. At scale, who knows, the > reduction in number of queries probably adds up. > > And then there's the information harvesters, who query hosted domains > in sequence. They actually seem to account for around 40% of our > 'normal' ANY traffic with just a few IP addresses. > > Cya, > Jona > > _______________________________________________ > dns-operations mailing list > dns-operations@lists.dns-oarc.net > https://lists.dns-oarc.net/mailman/listinfo/dns-operations > dns-jobs<https://lists.dns-oarc.net/mailman/listinfo/dns-operationsdns-jobs>mailing > list > https://lists.dns-oarc.net/mailman/listinfo/dns-jobs >
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