<div dir="ltr">Thanks Lyle, I did not mean to say that list was <span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px">defunct</span>, quite the opposite, I felt that I was a bit spamming it with non global operational DNS issue.... <div>
<br></div><div>Yes, I did not debug well, went for the quick fix of clearing the cache.... That being said, end users query for the name and the IPs, always... but then here they were only getting the CNAME... so am trying to figure out in what circumstances would that occur... Would a recursive resolver that has the CNAME in cache, but the A records expired, fail to resolve the A records, return just the CNAME? </div>
<div><br></div><div>Thanks a lot,</div><div>Mohamed.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Jul 6, 2014 at 3:13 PM, Lyle Giese <span dir="ltr"><<a href="mailto:lyle@lcrcomputer.net" target="_blank">lyle@lcrcomputer.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
You waited less than an hour before proclaiming the list defunct?
It's Sunday in most of the world. Most of us are doing other things
than sitting on this list.<br>
<br>
That said, my initial thought is that your server answered your
question. Nothing more. Did you ask it for the A record for
<a href="http://googlemail.l.google.com" target="_blank">googlemail.l.google.com</a> ? That might have told you more.<br>
<br>
Lyle Giese<br>
LCR Computer Services, Inc.<div><div class="h5"><br>
<br>
<div>On 07/06/14 13:38, Mohamed Lrhazi
wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">
<div dir="ltr">I am thinking this list is not appropriate for some
of my questions... Could someone suggest a better one, maybe as
active and rich, as this one, but more appropriate for general
DNS discussions?
<div><br>
</div>
<div>Thanks a lot,</div>
<div>Mohamed.</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Sun, Jul 6, 2014 at 2:02 PM, Mohamed
Lrhazi <span dir="ltr"><<a href="mailto:ml623@georgetown.edu" target="_blank">ml623@georgetown.edu</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">We had a little mail outage which turned out
to be caused by one of our caching DNS servers returning
the bellow incomplete reply.
<div>
<br>
</div>
<div>Clearing the cache on the problematic server fixed
the issue.... </div>
<div><br>
</div>
<div>Am thinking it is now impossible for me to find the
root cause in this instance... but wondering if you guys
could hint at what could cause such a problem... bugs in
the DNS servers involved? temporary misconfig at
Google's servers? network issue?</div>
<div><br>
</div>
<div>The setup is a bit convoluted:</div>
<div><br>
</div>
<div>cache server --> resolver cache server -->
Internet</div>
<div><br>
</div>
<div>The fix was clearing at the first server. so I am
guessing at some point the resolver gave the incomplete
answer.</div>
<div><br>
</div>
<div>Thanks a lot,</div>
<div>Mohamed.</div>
<div><br>
</div>
<div>
<div>➜ ~ dig <a href="http://mail.google.com" target="_blank">mail.google.com</a>
@<a href="http://141.161.100.201" target="_blank">141.161.100.201</a></div>
<div><br>
</div>
<div>
; <<>> DiG 9.9.5-3-Ubuntu <<>>
<a href="http://mail.google.com" target="_blank">mail.google.com</a>
@<a href="http://141.161.100.201" target="_blank">141.161.100.201</a></div>
<div>;; global options: +cmd</div>
<div>;; Got answer:</div>
<div>;; ->>HEADER<<- opcode: QUERY, status:
NOERROR, id: 20414</div>
<div>;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY:
4, ADDITIONAL: 5</div>
<div><br>
</div>
<div>;; OPT PSEUDOSECTION:</div>
<div>; EDNS: version: 0, flags:; udp: 4096</div>
<div>;; QUESTION SECTION:</div>
<div>;<a href="http://mail.google.com" target="_blank">mail.google.com</a>.<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>A</div>
<div><br>
</div>
<div>
;; ANSWER SECTION:</div>
<div><a href="http://mail.google.com" target="_blank">mail.google.com</a>.<span style="white-space:pre-wrap"> </span>10213<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>CNAME<span style="white-space:pre-wrap"> </span><a href="http://googlemail.l.google.com" target="_blank">googlemail.l.google.com</a>.</div>
<div><br>
</div>
<div>;; AUTHORITY SECTION:</div>
<div><a href="http://google.com" target="_blank">google.com</a>.<span style="white-space:pre-wrap"> </span>96485<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>NS<span style="white-space:pre-wrap"> </span><a href="http://ns2.google.com" target="_blank">ns2.google.com</a>.</div>
<div><a href="http://google.com" target="_blank">google.com</a>.<span style="white-space:pre-wrap"> </span>96485<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>NS<span style="white-space:pre-wrap"> </span><a href="http://ns3.google.com" target="_blank">ns3.google.com</a>.</div>
<div><a href="http://google.com" target="_blank">google.com</a>.<span style="white-space:pre-wrap"> </span>96485<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>NS<span style="white-space:pre-wrap"> </span><a href="http://ns4.google.com" target="_blank">ns4.google.com</a>.</div>
<div><a href="http://google.com" target="_blank">google.com</a>.<span style="white-space:pre-wrap"> </span>96485<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>NS<span style="white-space:pre-wrap"> </span><a href="http://ns1.google.com" target="_blank">ns1.google.com</a>.</div>
<div><br>
</div>
<div>;; ADDITIONAL SECTION:</div>
<div><a href="http://ns3.google.com" target="_blank">ns3.google.com</a>.<span style="white-space:pre-wrap"> </span>108462<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>A<span style="white-space:pre-wrap"> </span><a href="tel:216.239.36.10" value="+12162393610" target="_blank">216.239.36.10</a></div>
<div><a href="http://ns4.google.com" target="_blank">ns4.google.com</a>.<span style="white-space:pre-wrap"> </span>108462<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>A<span style="white-space:pre-wrap"> </span><a href="tel:216.239.38.10" value="+12162393810" target="_blank">216.239.38.10</a></div>
<div><a href="http://ns1.google.com" target="_blank">ns1.google.com</a>.<span style="white-space:pre-wrap"> </span>108462<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>A<span style="white-space:pre-wrap"> </span><a href="tel:216.239.32.10" value="+12162393210" target="_blank">216.239.32.10</a></div>
<div><a href="http://ns2.google.com" target="_blank">ns2.google.com</a>.<span style="white-space:pre-wrap"> </span>108462<span style="white-space:pre-wrap"> </span>IN<span style="white-space:pre-wrap"> </span>A<span style="white-space:pre-wrap"> </span><a href="tel:216.239.34.10" value="+12162393410" target="_blank">216.239.34.10</a></div>
<div><br>
</div>
<div>;; Query time: 22 msec</div>
<div>;; SERVER: 141.161.100.201#53(141.161.100.201)</div>
<div>;; WHEN: Sun Jul 06 12:42:09 EDT 2014</div>
<div>;; MSG SIZE rcvd: 207</div>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
</blockquote>
</div>
<br>
</div>
<br>
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