On Thu, 1 May 2014, Sean Cody wrote:
I thought most CDNs went via the local ASN... if tunneled, though, it
probably messes with a lot of such things.
Depends on the CDN, though my limited exposure to them imply reference
locality tends toward relation to originating route not by geography.
Yep. Akamai at least only serves up within the same. Google similar,
IIRC. Unsure about Netflix.
Google DNS also seems to prefer AAAA records over v4, even, in my
experience. (that was odd troubleshooting)
Yeah, I'd like to hear about your experience (off thread) as the
statement is a bit odd and missing some context. Decision is up to the
client, when you do a host lookup for an A record you don't get a
AAAA... if you do an ANY lookup you'll get A, AAAA etc. If the client
is Google (say a crawler) then yeah a dual stacked host tends to prefer
v6 over v4 and if you have a published AAAA then that behavior is
expected and normal.
I would like to know of or find examples of systems that can be
configured to prefer a specific address family but so far my experience
is has shown it isn't configurable. I'm sure there is a specific RFC to
describe the behavior but... lazy. :)
If you are referring to Google's recursive resolvers... that's a super
interesting question given how they've implemented their v4 & v6 anycast
for those now rather famous resolvers.
Yeah, I think it's just the preference of any newer system with v6
interfaces. I believe, monitoring for queries before, that it seems to do
AAAA/A requests in quick succession, but not sure if I correlated that
with host requests, offhand.
Not super interesting. Was an odd caveat when transitioning a zone, and
forgetting I'd added a AAAA for fun.
--
Sean
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