SOA and NS are canonical records?

[June]

thanks for the reply.

Is there any reference says SOA and NS RRs both are canonical names? Or all
RRs, except CNAME (alias), are canonical names, by definition?

"The issue is what the "key" of this line is, the leftmost part." What do
mean by saying this? Do you mean "interior node" is the leftmost part?

<phn at icke-reklam.ipsec.nu> wrote in message
news:c78loo$16ok$1 at sf1.isc.org...
> June <nfbz2003 at yahoo.com> wrote:
> > In DNS and BIND 4th ed. p499, there is a sentence seems confusing to me:
>
> > "...Remember that fx.movie.edu has an SOA record and NS records, so
> > attaching a CNAME record to it violates the rule that a domain name be
> > either an alias or a canonical name, not both."
>
> > My understanding is that SOA and NS are neither alias or canonical
names,
> > and I don't understand this statement here.
>
> Both are canonical names. The issue is what the "key" of this line
> is, the leftmost part. In addition both SOA and NS records should
> have a "cononical name" on their right side too.
>
> > On the other hand, you may say by nature, SOA and NS point to canonical
> > names, so they are kind of alias (CNAME), ...and then, still doesn't
make
> > sense as then will be all aliases (allowable based on the above
statement?).
>
> CNAME defines "aliases". Basically a cname tells the querier :
> "restart your query but ask for <RHS of CNAME> instead.
>
> So any instance of a record that has both a CNAME and anything else
> creates an ambiguity ( is the answer what one of the returned answers
> or should i follow the new name instead).
>
> Maybe it's easier to say that a CNAME may never be combined with
> any other RR ( not even another cname)
>
> > Actually the sentence before this one seems already made the point:
>
> > "you can't have a CNAME record attached to an interior node like
> > fx.movie.edu if it owns other records."
>
> > So, basically "the other records" include A, SOA and NS, and CNAME
record
> > (alias) cannot exist with any of them at the same time.
>
> Frankly there is occations where cnames coexists with other data
> the most common is SIG ( used in DNSSEC). As dnssec is not
> widley spread you can ignore this for now.
>
>
> --
> Peter Håkanson
>         IPSec  Sverige      ( At Gothenburg Riverside )
>            Sorry about my e-mail address, but i'm trying to keep spam out,
>    remove "icke-reklam" if you feel for mailing me. Thanx.
>