In message <3c802402a28c4b2390b088242a91f...@ahsnbw1>, "Al Stu" writes:
>
> RFC 974:
> "There is one other special case. If the response contains an answer which
> is a CNAME RR, it indicates that REMOTE is actually an alias for some other
> domain name. The query should be repeated with the canonical domain name."
And that is talking about the response to a MX query. The section
from which you quote starts with:
Issuing a Query
The first step for the mailer at LOCAL is to issue a query for MX RRs
for REMOTE. It is strongly urged that this step be taken every time
a mailer attempts to send the message. The hope is that changes in
the domain database will rapidly be used by mailers, and thus domain
administrators will be able to re-route in-transit messages for
defective hosts by simply changing their domain databases.
and the paragraph after that which you quote is:
If the response does not contain an error response, and does not
contain aliases, its answer section should be a (possibly zero
length) list of MX RRs for domain name REMOTE (or REMOTE's true
domain name if REMOTE was a alias). The next section describes how
this list is interpreted.
So I would suggest that you stop taking text out of context.
CNAME -> MX is legal
MX -> CNAME is illegal
Mark
> ----- Original Message -----
> From: "Scott Haneda" <talkli...@newgeo.com>
> To: "Al Stu" <al_...@verizon.net>
> Cc: <bind-users@lists.isc.org>
> Sent: Monday, January 26, 2009 8:09 PM
> Subject: Re: BIND 9.6 Flaw - CNAME vs. A Record in MX Records are NOT
> "Illegal"
>
>
> > On Jan 26, 2009, at 7:54 PM, Al Stu wrote:
> >
> >> If you refuse a CNAME then it is your SMTP server that is broken. The
> >> SMTP RFC's clearly state that SMTP servers are to accept and lookup a
> >> CNAME.
> >
> >
> > [RFC974] explicitly states that MX records shall not point to an alias
> > defined by a CNAME. That is what I was talking about, are you saying
> > this is not correct? As this is what I was under the impression for
> > quite some time.
> > --
> > Scott
> >
>
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--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: mark_andr...@isc.org
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