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It might be worth pointing out<br>
a) that you're trying to recursively query a non-recursive nameserver<br>
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".<br>
<br>
- Kevin<br>
<br>
On 8/3/2010 12:08 AM, rams wrote:
<blockquote
cite="mid:AANLkTim6GJMi3KRLjiG9oupSk+k9kWMTAH2eOH=6c87a@mail.gmail.com"
type="cite">
<div>Hi ,</div>
<div> </div>
<div>I have data as follows</div>
<div> </div>
<div><a moz-do-not-send="true" href="http://a.rameshops5446.com">a.rameshops5446.com</a>.
86400 IN A 1.2.3.1<br>
<a moz-do-not-send="true" href="http://a.rameshops5446.com">a.rameshops5446.com</a>.
86400 IN MX 10 <a moz-do-not-send="true"
href="http://a.rameshops5446.com">a.rameshops5446.com</a>.<br>
</div>
<div>I queried domain "<a moz-do-not-send="true"
href="http://a.rameshops5446.com">a.rameshops5446.com</a>" with type
ANY against bind9.6 .</div>
<div> </div>
<div>Actual Result:</div>
<div>Bind is returning above two records in answer section and also
returning A record in additional section as follows.</div>
<div> </div>
<div># dig @localhost <a moz-do-not-send="true"
href="http://a.rameshops5446.com">a.rameshops5446.com</a>. any</div>
<div>; <<>> DiG 9.6.1-P3 <<>> @localhost <a
moz-do-not-send="true" href="http://a.rameshops5446.com">a.rameshops5446.com</a>.
any<br>
; (1 server found)<br>
;; global options: +cmd<br>
;; Got answer:<br>
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33411<br>
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 1<br>
;; WARNING: recursion requested but not available</div>
<div>;; QUESTION SECTION:<br>
;<a moz-do-not-send="true" href="http://a.rameshops5446.com">a.rameshops5446.com</a>.
IN ANY</div>
<div>;; ANSWER SECTION:<br>
<a moz-do-not-send="true" href="http://a.rameshops5446.com">a.rameshops5446.com</a>.
86400 IN MX 10 <a moz-do-not-send="true"
href="http://a.rameshops5446.com">a.rameshops5446.com</a>.<br>
<a moz-do-not-send="true" href="http://a.rameshops5446.com">a.rameshops5446.com</a>.
86400 IN A 1.2.3.1</div>
<div>;; AUTHORITY SECTION:<br>
<a moz-do-not-send="true" href="http://rameshops5446.com">rameshops5446.com</a>.
86400 IN NS <a moz-do-not-send="true"
href="http://udns2.ultradns.net">udns2.ultradns.net</a>.<br>
<a moz-do-not-send="true" href="http://rameshops5446.com">rameshops5446.com</a>.
86400 IN NS <a moz-do-not-send="true"
href="http://udns1.ultradns.net">udns1.ultradns.net</a>.</div>
<div>;; ADDITIONAL SECTION:<br>
<a moz-do-not-send="true" href="http://a.rameshops5446.com">a.rameshops5446.com</a>.
86400 IN A 1.2.3.1</div>
<div>;; Query time: 2 msec<br>
;; SERVER: 127.0.0.1#53(127.0.0.1)<br>
;; WHEN: Tue Aug 3 04:06:45 2010<br>
;; MSG SIZE rcvd: 137<br>
</div>
<div>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.</div>
<div> </div>
<div>Thanks & Regards,</div>
<div>Ramesh</div>
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