CNAME/MX question...

[Vyto Grigaliunas]

Hi...

Thanks for the reply...

Sorry I wasn't specific enough...

Here's the situation...

I've got the following CNAME in our primary domain pointing to a system in a
subdomain :

fnneta.fnal.gov.   IN   CNAME   fnneta.test.fnal.gov.

The authoritative server for the "test" subdomain has the following records
for fnneta.test.fnal.gov :

fnneta          IN      A       131.225.2.1
                IN      MX      0       fnneta
                IN      MX      100     heffalump.fnal.gov.
                IN      MX      200     woozle.fnal.gov.

I guess my question concerned mail addressed to vyto at fnneta.fnal.gov -
SMTP/sendmail should find the MX records associated with the target of the
CNAME, in this case fnneta.test.fnal.gov - I shouldn't need to associate the
MX records with the CNAME (which to me doesn't seem right), i.e. -

fnneta.fnal.gov.   IN   CNAME   fnneta.test.fnal.gov.
                             IN   MX     0    fnneta.test.fnal.gov.
                             IN   MX     100  heffalump.fnal.gov.
                             IN   MX     200  woozle.fnal.gov.

It seems to work (and I don't think it breaks any of the rules), but I just
wanted to make sure that this was something that wasn't recommended practice
with possible non-expected results...

> [Why eeyore, heffalump, and woozle, but no pooh or piglet???  ;->]

Sorry...I didn't name them...not a Pooh fan...now Homer Simpson...there's an
actor ;-)

Thanks...

Vyto

----- Original Message -----
From: "Joseph S D Yao" <jsdy at cospo.osis.gov>
To: "Vyto Grigaliunas" <vyto at fnal.gov>
Cc: <bind-users at isc.org>
Sent: Thursday, September 07, 2000 11:23 AM
Subject: Re: CNAME/MX question...


> On Thu, Sep 07, 2000 at 10:10:26AM -0500, Vyto Grigaliunas wrote:
> > I apologize in advance if this is not the proper forum for this
question...
> >
> > If SMTP mail is being addressed to a CNAME record and an MX record is
desired
> > to be associated with the CNAME, can I associate an MX record with the
CNAME
> > or will SMTP/sendmail follow the CNAME to the target canonical name and
find
> > the MX record(s) associated with that target canonical name.
>
> Proper forum.
>
> Your question is not clear.
>
> If you are addressing e-mail to vyto at grigaliunas.fnal.gov, and in the
> fnal.gov zone, the CNAME for grigaliunas is woozle.fnal.gov:
>
> grigaliunas IN  CNAME woozle.fnal.gov.
>
> then this will work fine.
>
> However, if you are sending e-mail to vyto at fnal.gov, and the mail
> server is heffalump.fnal.gov, but you put another name in the MX record
> whose CNAME is "heffalump":
>
> grigaliunas IN  CNAME heffalump.fnal.gov.
> @ IN  MX grigaliunas.fnal.gov.
>
> then this is NOT good.  The target of the MX record may not be a name
> that has a CNAME record.
>
> [Why eeyore, heffalump, and woozle, but no pooh or piglet???  ;->]
>
> --
> Joe Yao jsdy at cospo.osis.gov - Joseph S. D. Yao
> COSPO/OSIS Computer Support EMT-B
> -----------------------------------------------------------------------
> This message is not an official statement of COSPO policies.
>
>