[dns-operations] imdb.com (i.media-imdb.com (iwi.media-imdb.com))
bert.hubert at netherlabs.nl
Mon Mar 7 21:04:10 UTC 2011
On Mon, Mar 07, 2011 at 03:46:38PM -0500, Bob Paolucci wrote:
> i.media-imdb.com (iwi.media-imdb.com)
;; ANSWER SECTION:
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.
i.imdb.com.edgesuite.net. 900 IN CNAME a1969.g.akamai.net.
a1969.g.akamai.net. 20 IN A 126.96.36.199
a1969.g.akamai.net. 20 IN A 188.8.131.52
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
Perhaps your resolver vendor could be of assistance?
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