[155620] in North American Network Operators' Group
Re: Return two locations or low TTL [was: DNS caches that support
daemon@ATHENA.MIT.EDU (Tony Finch)
Mon Aug 20 10:12:28 2012
Date: Mon, 20 Aug 2012 15:11:52 +0100
From: Tony Finch <dot@dotat.at>
To: "Patrick W. Gilmore" <patrick@ianai.net>
In-Reply-To: <15BF47FF-9B3D-498B-A58B-F03853F0BA08@ianai.net>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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/
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