Clarification on ANY query

[Kevin Darcy]

It might be worth pointing out
a) that you're trying to recursively query a non-recursive nameserver
b) that the MX record is technically superfluous, since its target is 
the same as the owner name, and all mail clients will fail over to doing 
an A query of the same name if no MX record is present. I understand, 
however, that if your negative-caching parameter for the zone needs to 
be low for some reason (relative to your positive-caching 1-day TTL), 
then the presence of the MX record might save you a certain amount of 
query traffic, and therefore serve a practical purpose even if "redundant".

                                                                         
                                     - Kevin

On 8/3/2010 12:08 AM, rams wrote:
> Hi ,
> I have data as follows
> a.rameshops5446.com <http://a.rameshops5446.com>. 86400 IN A 1.2.3.1
> a.rameshops5446.com <http://a.rameshops5446.com>. 86400 IN MX 10 
> a.rameshops5446.com <http://a.rameshops5446.com>.
> I queried domain "a.rameshops5446.com <http://a.rameshops5446.com>" 
> with type ANY against bind9.6 .
> Actual Result:
> Bind is returning above two records in answer section and also 
> returning A record in additional section as follows.
> # dig @localhost a.rameshops5446.com <http://a.rameshops5446.com>. any
> ; <<>> DiG 9.6.1-P3 <<>> @localhost a.rameshops5446.com 
> <http://a.rameshops5446.com>. any
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33411
> ;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 1
> ;; WARNING: recursion requested but not available
> ;; QUESTION SECTION:
> ;a.rameshops5446.com <http://a.rameshops5446.com>.           IN      ANY
> ;; ANSWER SECTION:
> a.rameshops5446.com <http://a.rameshops5446.com>.    86400   IN      
> MX      10 a.rameshops5446.com <http://a.rameshops5446.com>.
> a.rameshops5446.com <http://a.rameshops5446.com>.    86400   IN      
> A       1.2.3.1
> ;; AUTHORITY SECTION:
> rameshops5446.com <http://rameshops5446.com>.      86400   IN      NS 
> udns2.ultradns.net <http://udns2.ultradns.net>.
> rameshops5446.com <http://rameshops5446.com>.      86400   IN      NS 
> udns1.ultradns.net <http://udns1.ultradns.net>.
> ;; ADDITIONAL SECTION:
> a.rameshops5446.com <http://a.rameshops5446.com>.    86400   IN      
> A       1.2.3.1
> ;; Query time: 2 msec
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
> ;; WHEN: Tue Aug  3 04:06:45 2010
> ;; MSG SIZE  rcvd: 137
> Here my doubt is A record already returned in answer section why the 
> same A record is returning in additional section. I know if MX pointed 
> record have any A/AAAA records will return in additional section. but 
> in above case already the same A record returned in answer section. Is 
> bind result correct? could you please clarify me.
> Thanks & Regards,
> Ramesh
>
>
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