On Thu, Aug 26, 2021 at 1:24 AM Viktor Dukhovni <ietf-d...@dukhovni.org> wrote:
> On Tue, Aug 24, 2021 at 05:23:31AM -0700, Éric Vyncke via Datatracker > wrote: > > > -- Section 2.1 -- > > I support Erik Kline's COMMENT on this and am raising it to a blocking > DISCUSS. > > > > A/ in all the discussion in the last §, a AAAA would have the same > benefit when > > compared to a NS QTYPE. Or what did I miss ? > > Actually, it might not be quite as effective in practice. The reason is > that "AAAA" records are absent more often than "A" records, and when "A" > records are present, but "AAAA" records are not, "AAAA" queries elicit a > "denial of existence" response. > > Unfortunately, broken denial of existence, though rare, is not as > infrequent as I'd like. I see a non-negligible set of names where "A" > queries return answers, but "AAAA" queries SERVFAIL. > > I am not aware of any advantage to using "AAAA" for the qname > minimisation queries, so "A" appears to me to be the better choice. > > <no hats> Yah, I agree -- but, the proposed text suggests that you can use either A or AAAA. I'm assuming that implementations will default to QTYPE=A now, but, Real Soon Now, once IPv6 is all deployed, will default to QTYPE=AAAA. I'm presuming that implementers will be bright enough to choose the most dominant / least borken QTYPE over time. </no hats> W > Examples: > > > https://dnssec-stats.ant.isi.edu/~viktor/dnsviz/qmin.d/mail.ajsuarez.com.html > > https://dnssec-stats.ant.isi.edu/~viktor/dnsviz/qmin.d/mail.puz.de.html > > https://dnssec-stats.ant.isi.edu/~viktor/dnsviz/qmin.d/gloria.sntech.de.html > > https://dnssec-stats.ant.isi.edu/~viktor/dnsviz/qmin.d/mx1.espresso-gridpoint.net.html > > https://dnssec-stats.ant.isi.edu/~viktor/dnsviz/qmin.d/exchange.hctec.net.html > > https://dnssec-stats.ant.isi.edu/~viktor/dnsviz/qmin.d/fallback.hctec.net.html > > -- > Viktor. > > _______________________________________________ > DNSOP mailing list > DNSOP@ietf.org > https://www.ietf.org/mailman/listinfo/dnsop > -- The computing scientist’s main challenge is not to get confused by the complexities of his own making. -- E. W. Dijkstra
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