In message <20120607165818.ga30...@srv03.cluenet.de>, Daniel Roesen writes: > On Thu, Jun 07, 2012 at 07:52:29AM -0600, Dave Temkin wrote: > > Just to close the loop on this - UltraDNS has an issue with CNAMEs and > > their Directional DNS service. We (Netflix) have applied a workaround and > > it appears stable. > > Hm, looking at http://v6launch.ripe.net/, whatever you changed didn't > improve visibility of the AAAA, but decreased it.
TTL's of zero don't help. The A query has a TTL of 3600 in the response the AAAA query has a zero TTL. This is rocket science. This isn't hard to do correctly. How to handle CNAMEs has been specified 1/4 of a century. > Best regards, > Daniel > > -- > CLUE-RIPE -- Jabber: d...@cluenet.de -- dr@IRCnet -- PGP: 0xA85C8AA0 > -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org