I could need some help understanding the rules when assigning
names to NS and MX records for my domains (I run my own Name Server).

Here's what I have:

1. I host the domain tempel.org.
2. On my server, I run a Name Server, a Mail and a Web Server
3. Until now, the NS records look like this (I used NonSequitur):

tempel.org.       A      64.174.138.122
mail.tempel.org.  CNAME  tempel.org.
ns.tempel.org.    CNAME  tempel.org.

Then, I had these NS and MX assignments:

tempel.org.       NS     ns.tempel.org
tempel.org.       MX     mail.tempel.org

I also have registered with my domain provider the name
"ns.tempel.org" as a domain name server, and list that one
with my master records.

Now to the question:

Recently, I installed the Trial version of Quick DNS, which
complained about the NS and MX entries. It was only happy
when I changed them to use the A name, like this:

tempel.org.       NS     tempel.org
tempel.org.       MX     tempel.org

I have another domain, where I had used:

sepic.org.       NS       ns.tempel.org

Here, QDNS did not complain (because it appears not to to
crossref-tests between the various domains), but BIND later
wrote to the log file:

 info: "tempelmann.com IN NS" points to a CNAME (ns.tempel.org)

... which again signals that it does not like to see CNAMEs
in NS entries.

Well, I can live with that. I can change them all to use only
the A record's name (tempel.org)

But one question remains: What about the fact that the master
entry for my domain lists "ns.tempel.org" as the NS, not
"tempel.org" (actually, if I'd try to use "tempel.org", I'd
get quite a severe sounding warning that I should not do this).

With that, it appears to me that the master record does not
comply with my zone's SOA and NS infos (I understand that I
should use the NS record's name also for the SOA record,
right?):

The master records say the SOA NS is ns.tempel.org, while my
own records say it's "tempel.org".

Now, is that a problem? Or is that just fine this way?

Thomas

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