<div dir="ltr"><div dir="ltr">On Fri, Apr 3, 2020 at 8:20 AM Stephane Bortzmeyer <<a href="mailto:bortzmeyer@nic.fr">bortzmeyer@nic.fr</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Fri, Apr 03, 2020 at 07:48:16AM -0400,<br>
Shumon Huque <<a href="mailto:shuque@gmail.com" target="_blank">shuque@gmail.com</a>> wrote <br>
a message of 98 lines which said:<br>
<br>
> The second one, <a href="http://doesnotexist.monitor.itconsult.net" rel="noreferrer" target="_blank">doesnotexist.monitor.itconsult.net</a>., does not appear to be<br>
> delegated from its parent.<br>
<br>
This is not what I see. Both are delegated from <a href="http://itconsult.net" rel="noreferrer" target="_blank">itconsult.net</a><br>
(source: their SOA).<br></blockquote><div><br></div><div>Ah, yes. The subtlety here (which I didn't notice at first) is that <a href="http://monitor.itconsult.net">monitor.itconsult.net</a> is served by the same name servers as its parent. Since most authority servers answer from their closest enclosing zone, most iterative debugging tools like dig+trace etc won't see the delegation.</div><div><br></div><div>Shumon.</div><div><br></div></div></div>