[119374] in North American Network Operators' Group
Re: What DNS Is Not
daemon@ATHENA.MIT.EDU (Glen Turner)
Mon Nov 16 21:33:02 2009
Date: Tue, 17 Nov 2009 13:01:41 +1030
From: Glen Turner <gdt@gdt.id.au>
To: Jack Bates <jbates@brightok.net>
In-Reply-To: <4AF83515.8040404@brightok.net>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 10/11/09 01:58, Jack Bates wrote:
> And different CDN's behave differently, depending on how they deliver
> content, support provider interconnects, etc. I'd hardly call many of
> them DNS lies, as they do resolve you to the appropriate IP, and if that
> IP disappears, try and quickly get you to another appropriate IP.
It depends what you mean by "appropriate". It may not be "least cost"
or "closest", and that can be a rude shock when the CDN traffic suddenly
costs you A$5/GB (delivered from the US by undersea cable) rather than
$0 (delivered from an in-country peer).
DNS is the wrong answer, simply because there's no way for the user to
express *their* policy. But since there no CDN support in HTTP.....
--
Glen Turner <http://www.gdt.id.au/~gdt/>
