I not only say it, I have demonstrated it.
BIND is the DNS system we are discussing.
Have not looked to see if that specifically is spec'ed in an RFC.
Yes other DNS implementations do return both the A and CNAME.
*** PLEASE don't copy me on replies, I'll read them in the group ***
----- Original Message -----
From: <bsfin...@anl.gov>
To: <bind-users@lists.isc.org>
Sent: Tuesday, January 27, 2009 9:52 AM
Subject: e: BIND 9.6 Flaw - CNAME vs. A Record in MX Records are NOT
"Illegal"
Al Stu" <al_...@verizon.net> wrote:
How about these two?
nullmx.domainmanager.com
Non-authoritative answer:
Name: mta.dewile.net
Address: 69.59.189.80
Aliases: nullmx.domainmanager.com
smtp.secureserver.net
Non-authoritative answer:
Name: smtp.where.secureserver.net
Address: 208.109.80.149
Aliases: smtp.secureserver.net
There are two reasons it does not blow up in peoples face. 1) If it is in
the CNAME RR points to an A record in the same zone, both the A record and
the CNAME record are returned, thus meeting the A record requirement. 2)
SMTP servers are required to accept an alias and look it up. Thus there
is
no need for this.
And no it does not matter if there are multiple MX records with different
preferences values.
You say, "both the A record and the CNAME record are returned."
We know that BIND does this. Is this part of the RFC? Do other DNS
implementation return both the "A" and the CNAME?
----------------------------------------------------------------------
Barry S. Finkel
Computing and Information Systems Division
Argonne National Laboratory Phone: +1 (630) 252-7277
9700 South Cass Avenue Facsimile:+1 (630) 252-4601
Building 222, Room D209 Internet: bsfin...@anl.gov
Argonne, IL 60439-4828 IBMMAIL: I1004994
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