[dns-operations] imdb.com (i.media-imdb.com (iwi.media-imdb.com))

Bob Paolucci Bob.Paolucci at rci.rogers.com
Mon Mar 7 21:05:23 UTC 2011

Indeed, actively working on this with our vendor.

Thanks for the input.

-----Original Message-----
From: bert hubert [mailto:bert.hubert at netherlabs.nl] 
Sent: March-07-11 4:04 PM
To: Bob Paolucci
Cc: dns-operations at mail.dns-oarc.net
Subject: Re: [dns-operations] imdb.com (i.media-imdb.com

On Mon, Mar 07, 2011 at 03:46:38PM -0500, Bob Paolucci wrote:
> i.media-imdb.com (iwi.media-imdb.com)

i.media-imdb.com.	180	IN	CNAME	iwi.media-imdb.com.
iwi.media-imdb.com.	60	IN	CNAME	iai.media-imdb.com.
iai.media-imdb.com.	10800	IN	CNAME
i.imdb.com.edgesuite.net. 900	IN	CNAME	a1969.g.akamai.net.
a1969.g.akamai.net.	20	IN	A
a1969.g.akamai.net.	20	IN	A

Wow. From a cold cache the PowerDNS Recursor needs *24-26 packets* to
resolve this chain (and it is known to be reasonably thrifty in this

I don't see anything particularly odd, except for the length of this
CNAME chain.  It may be that the 20 second and 60 second TTLs cause some
'resonance' for some resolvers.

The chain is very long though.

> Could this come down to the CNAME being at the zone apex Could have 
> something to do with the resolver we're using not liking that.

Perhaps your resolver vendor could be of assistance?

-------------- next part --------------

This e-mail (and attachment(s)) is confidential, proprietary, may be subject to copyright and legal privilege and no related rights are waived. If you are not the intended recipient or its agent, any review, dissemination, distribution or copying of this e-mail or any of its content is strictly prohibited and may be unlawful. All messages may be monitored as permitted by applicable law and regulations and our policies to protect our business. E-mails are not secure and you are deemed to have accepted any risk if you communicate with us by e-mail. If received in error, please notify us immediately and delete the e-mail (and any attachments) from any computer or any storage medium without printing a copy.

Ce courriel (ainsi que ses pi?ces jointes) est confidentiel, exclusif, et peut faire l?objet de droit d?auteur et de privil?ge juridique; aucun droit connexe n?est exclu. Si vous n??tes pas le destinataire vis? ou son repr?sentant, toute ?tude, diffusion, transmission ou copie de ce courriel en tout ou en partie, est strictement interdite et peut ?tre ill?gale. Tous les messages peuvent ?tre surveill?s, selon les lois et r?glements applicables et les politiques de protection de notre entreprise. Les courriels ne sont pas s?curis?s et vous ?tes r?put?s avoir accept? tous les risques qui y sont li?s si vous choisissez de communiquer avec nous par ce moyen. Si vous avez re?u ce message par erreur, veuillez nous en aviser imm?diatement et supprimer ce courriel (ainsi que toutes ses pi?ces jointes) de tout ordinateur ou support de donn?es sans en imprimer une copie. 

More information about the dns-operations mailing list