[155619] in North American Network Operators' Group
Re: Return two locations or low TTL [was: DNS caches that support
daemon@ATHENA.MIT.EDU (Dobbins, Roland)
Mon Aug 20 10:08:58 2012
From: "Dobbins, Roland" <rdobbins@arbor.net>
To: NANOG list <nanog@nanog.org>
Date: Mon, 20 Aug 2012 14:07:34 +0000
In-Reply-To: <0D919D57-BDA0-4FDA-873D-3DC0CD5745C0@ianai.net>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Aug 20, 2012, at 5:56 PM, Patrick W. Gilmore wrote:
> My question above is asking Mark how you guarantee the user/application s=
elects the A record closest to them and only use the other A record when th=
e closer one is unavailable.
I understand - my point was that folks using a GSLB-type solution would gen=
erally include availability probing in the GSLB stack, so that a given inst=
ance won't be included in answers if it's locally unavailable (obviously, t=
he GSLB can't know about all path elements between the querying resolver an=
d the desired server/service).
-----------------------------------------------------------------------
Roland Dobbins <rdobbins@arbor.net> // <http://www.arbornetworks.com>
Luck is the residue of opportunity and design.
-- John Milton
