On Fri, Jun 08, 2012 at 12:11:20PM +1000, Mark Andrews wrote: > > $ 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. > > Which is just plain BROKEN.
Yup. > > 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. > > It's not DNS trickery. The "trickery" is returning different CNAMEs for QTYPE=A and QTYPE=AAAA. I'm not sure what's the goal of that is, but it's 4am here so I have an excuse of not seeing the light. :) Best regards, Daniel -- CLUE-RIPE -- Jabber: [email protected] -- dr@IRCnet -- PGP: 0xA85C8AA0
