<div dir="ltr"><div class="gmail_extra"><div><div class="gmail_signature" data-smartmail="gmail_signature"><br></div></div><div class="gmail_quote">On Thu, Jul 13, 2017 at 8:39 PM, <span dir="ltr"><<a href="mailto:bind@zq3q.org" target="_blank">bind@zq3q.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Bob:<br>
<br>
These examples help! Thank you.<br>
<span class=""><br>
On Thu 7/13/17 15:53 -0400 Bob Harold wrote:<br>
> Let's illustrate one NS record, for each of the cases:<br>
> (I think your case is #2)<br>
><br>
> 1. Name server name inside the domain itself<br>
><br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> zone:<br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> IN NS <a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a><br>
> <a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a> IN A x.x.x.x<br>
><br>
> the TLD com would have (entered by the registrar)<br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> IN NS <a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a><br>
> <a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a> IN A x.x.x.x (this is a "glue" record)<br>
<br>
</span>OK. This example is the most commonly seen in web searches.<br>
<span class=""><br>
> 2. Name server name in another domain:<br>
><br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> zone:<br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> IN NS <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a><br>
><br>
> TLD com zone:<br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> IN NS <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a><br>
> (no glue record)<br>
<br>
</span>Exactly one delegation NS record.<br>
<br>
Several have made that clear; ie I now clearly understand there is<br>
*not* another NS delegation record needed in the zone with the $ORIGIN<br>
that is part of the ("non vanity") nameserver's FQDN.<br>
<span class=""><br>
> <a href="http://otherdomain.com" rel="noreferrer" target="_blank">otherdomain.com</a> zone:<br>
> <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a> IN A x.x.x.x<br>
<br>
</span>Almost goes without saying that above A record is needed.<br>
<span class=""><br>
> 3. Sibling domains with name servers for each other: (should be avoided?)<br>
><br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> zone:<br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> IN NS <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a><br>
> <a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a> IN A x.x.x.x<br>
><br>
> <a href="http://otherdomain.com" rel="noreferrer" target="_blank">otherdomain.com</a> zone:<br>
> <a href="http://otherdomain.com" rel="noreferrer" target="_blank">otherdomain.com</a> IN NS <a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a><br>
> <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a> IN A x.x.x.x<br>
><br>
> TLD com zone:<br>
> <a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> IN NS <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a><br>
> <a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a> IN A x.x.x.x (glue record?)<br>
> <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a> IN A x.x.x.x (glue record?)<br>
<br>
</span>Interesting. I think the glue record make sense.<br>
I'm not planning to do this. :-><br>
<br>
I do not see any delegation NS record for <a href="http://otherdomain.com" rel="noreferrer" target="_blank">otherdomain.com</a> above.<br>
Is this right?:<br>
<span class=""><br>
TLD com zone:<br>
<a href="http://example.com" rel="noreferrer" target="_blank">example.com</a> IN NS <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a><br>
<a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a> IN A x.x.x.x (glue record?)<br>
<a href="http://otherdomain.com" rel="noreferrer" target="_blank">otherdomain.com</a> IN NS <a href="http://ns.example.com" rel="noreferrer" target="_blank">ns.example.com</a><br>
</span> <a href="http://ns.otherdomain.com" rel="noreferrer" target="_blank">ns.otherdomain.com</a> IN A x.x.x.x (glue record?)<br>
<br>
--<br>
thanks,<br>
Tom<br>
</blockquote></div><br></div><div class="gmail_extra">You are correct, the TLD needs the records that you show. </div><div class="gmail_extra"><br></div><div class="gmail_extra">And as others have said, there should be at least 2 or 3 name servers for every zone, and they should be on different networks. I was trying to show the various cases that apply to each *one* of the NS and glue records.</div><div class="gmail_extra"><br></div><div class="gmail_extra">-- </div><div class="gmail_extra">Bob Harold</div><div class="gmail_extra"><br></div></div>