On Thu, Jun 07, 2012 at 04:43:41PM -0700, David Temkin wrote:
What do you mean? www.netflix.com is dual stacked, which represents availability of our website (and PC/Mac streaming clients) to100% of our users who have IPv6.
The zero TTL on the CNAME an AAAA RRs makes www.netflix.com zero-stacked at least for some resolvers: $ dig @pdns3.ultradns.org www.netflix.com. A +norec +short wwwservice--frontend-313423742.us-east-1.elb.amazonaws.com. $ dig @pdns3.ultradns.org www.netflix.com. AAAA +norec +short dualstack.wwwservice--frontend-313423742.us-east-1.elb.amazonaws.com. $ dig @pdns3.ultradns.org www.netflix.com. ANY +short +norec $ Resolving www.netflix.com using ANY RRtype fails with an empty answer section in the DNS response. This DNS trickery seems to be from the "taking a shower, trying not to get wet" department. And has adverse effects in corner cases. While playing around, I had periods of time where I couldn't resolve the FQDN at all, possibly due some caching of the empty response. Best regards, Daniel -- CLUE-RIPE -- Jabber: dr@cluenet.de -- dr@IRCnet -- PGP: 0xA85C8AA0