<div dir="ltr"><div dir="ltr"></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 17, 2020 at 2:00 AM Mark Andrews <<a href="mailto:marka@isc.org" target="_blank">marka@isc.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Can you please explain why your servers are returning NOTIMP<br>
for unknown types outside of the range reserved for meta types (128-255)?<br>
<br>
The RFC compliant rcode is NOERROR for names that exist and NXDOMAIN for<br>
names that do not exist. See RFC3597. <br></blockquote><div><br></div><div>Hey Mark,</div><div><br></div><div>Not sure the motivation for why the server does that, but I agree it should be NOERROR or NXDOMAIN for all RTYPEs that don't exist including unknown ones. We're looking into this and will get back to you.</div><div><br></div><div>-Bob</div></div></div>