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Re: Return two locations or low TTL [was: DNS caches that support partitioning ?]
From: Tony Finch <dot () dotat at>
Date: Mon, 20 Aug 2012 15:11:52 +0100

Patrick W. Gilmore <patrick () ianai net> wrote:
On Aug 20, 2012, at 08:47 , Chris Adams <cmadams () hiwaay net> wrote:

Most anything that supports IPv6 should handle this correctly, since
getaddrinfo() will return a list of addresses to try.

Ah, the amazing new call which destroys any possibility of randomness or
round robin or other ways of load balancing between A / AAAA records.
Yes, all of us returning more than one A / AAAA record are hoping that
gets widely deployed instantly.  Or not.

The problem is RFC 3484 address selection; getaddrinfo is just the usual
place this is implemented. I had believed that there was work in progress
to fix this problem with the specs but it seems to have stalled.
http://tools.ietf.org/html/draft-ietf-6man-rfc3484-revise-05

Tony.
-- 
f.anthony.n.finch  <dot () dotat at>  http://dotat.at/
Forties, Cromarty: East, veering southeast, 4 or 5, occasionally 6 at first.
Rough, becoming slight or moderate. Showers, rain at first. Moderate or good,
occasionally poor at first.


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