[Pdns-users] External CNames

[Ross Halliday]

Setting a CNAME to an external host is not as uncommon as you might
think - we have several customers who have DNS with us but use a third
party for hosted Exchange or SharePoint. In this case they would do
something like point "sharepoint.customerdomain.tld" as a CNAME to
"hostedmicrosoftstuff.someprovider.tld"

We don't have PowerDNS rolled out here yet so I can't speak from
experience, but it makes sense to me that PowerDNS might just
regurgitate the contents of the record for a CNAME whereas everything
else is processed internally, hence the period is not required?

Just a thought

Cheers
---
Ross Halliday
Network Operations
WTC Communications

Office: 613-547-6939 x203
Helpdesk: 866-547-6939 option 2
http://www.wtccommunications.ca

> -----Original Message-----
> From: pdns-users-bounces at mailman.powerdns.com [mailto:pdns-users-
> bounces at mailman.powerdns.com] On Behalf Of andreas
> Sent: Friday, March 05, 2010 8:50 AM
> To: pdns-users at mailman.powerdns.com
> Subject: Re: [Pdns-users] External CNames
> 
> I was just curious to ask why you use cname to extrenal sources,
you're
> internal
> pdns would not be authoritative to you external bind installation and
> would
> end up quaite strange.
> It sound much easier to make a zone transfer between them.
> sorry to interfere this discussion but i have to ask
> 
> 
> One more thing, if you set up things like you did, with a cname and
all
> that. It sound strange
> that you need the ending dot. My experience with mysql backend is that
> the
> ending dot is not nessesery and pdns will cope very well with out it.
> But on
> other hand could this be OS related or wich version of pdns you run,
> and
> probably something for pdns staff to put their teeth in to.
> 
> 
> 
> 
> 
> 
> Hello all,
> 
> I checked this in with our PDNS
> 
> if we have an external CNAME then we have to write the content with a
> dot in
> the end,
> for internal cnames this doen't work there you must write the content
> without a dot.
> 
> Can anybody confirm this behaivor ?
> 
> Regards
> Marco
> 
> On Tue, Mar 02, 2010 at 04:24:44PM -0000, Ian Mordey wrote:
> > Thanks. Problem solved.
> >
> > -----Original Message-----
> > From: James Devine [mailto:fxmulder at gmail.com]
> > Sent: 02 March 2010 16:14
> > To: Ian Mordey
> > Cc: pdns-users at mailman.powerdns.com
> > Subject: Re: [Pdns-users] External CNames
> >
> > yes, we are using gmysql and we had a blank entry in the records
> table
> > which was taken to be '.' so powerdns thought it was authoritative
> for
> > '.', once we removed that entry we are now sending a status of
> > SERVFAIL instead of NXDOMAIN.
> >
> > On Tue, Mar 2, 2010 at 8:54 AM, Ian Mordey <ian.mordey at griffin.com>
> wrote:
> > > James
> > > Did you ever get an answer to this question? We have the same
> issue..
> > >
> > > Thanks
> > > Ian
> > >
> > > -----Original Message-----
> > > From: pdns-users-bounces at mailman.powerdns.com
> > > [mailto:pdns-users-bounces at mailman.powerdns.com] On Behalf Of
James
> > > Devine
> > > Sent: 23 February 2010 16:58
> > > To: pdns-users at mailman.powerdns.com
> > > Subject: [Pdns-users] External CNames
> > >
> > > I have a powerdns setup with a mysql backend, if I have a 3rd
level
> > > host CNAMEd to an external domain, it answers but the status is
> > > NXDOMAIN, if it CNAMEs to a domain for which it is authoritative
> for
> > > it returns NOERROR.  The recursor that powerdns is configured with
> is
> > > an external bind recursor which can resolve the external domains
> fine.
> > >  Any idea where I might be going wrong?
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