A record of domain name must be name server ?

Sam Wilson Sam.Wilson at ed.ac.uk
Thu Sep 11 14:24:33 UTC 2014

In article <mailman.902.1410422525.26362.bind-users at lists.isc.org>,
 Antonio Querubin <tony at lavanauts.org> wrote:

> On Thu, 11 Sep 2014, Matus UHLAR - fantomas wrote:
> > If you point www CNAME @, the 'www' will have both MX and NS records same as
> > example.com.  Which may e.g. cause rejectd on backup MX hosts, apparently
> > not designed to receive mail for www.example.com.
> Actually no.  All other RRs are supposed to be ignored (except for RRSIG, 
> etc) once the CNAME exists.  Ie. the MX and NS RRs exist only for 
> example.com, but not www.example.com.

I think that's a misunderstanding of what Matus wrote.  With separate A 
records then www.example.com will only have an A record.  If you alias 
www to @ then looking up MX and NS records for www will return the ones 
for example.com.


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