On Fri, Apr 3, 2020 at 7:35 AM Matthew Richardson <[email protected]> wrote:
> I am observing responses from particular authoratitive servers for > non-existant domains, which is puzzling me. I thought I understood this > topic, but am now having doubts... > > Consider two (real) non-existant records (which are not empty non-terminals > - there is nothing below them):- > > doesnotexist.mtgmon.itconsult.net > doesnotexist.monitor.itconsult.net > > where mtgmon.itconsult.net & monitor.itconsult.net are delegated to > different authoratitives. > > Querying each against the authoratitives returns NOERROR with "ANSWER: 0" > for the first one and NXDOMAIN for the second, behaviour which is > consistent across all the authoratitives:- > The second one, doesnotexist.monitor.itconsult.net., does not appear to be delegated from its parent. That's why you're getting NXDOMAIN - that response is coming from the parent zone: itconsult.net. >> Query: doesnotexist.monitor.itconsult.net. A IN at zone itconsult.net. >> Send to zone itconsult.net. at address 193.201.42.1 ERROR: NXDOMAIN: doesnotexist.monitor.itconsult.net. not found Shumon.
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