[195623] in North American Network Operators' Group
Re: Google DNS --- Figuring out which DNS Cluster you are using
daemon@ATHENA.MIT.EDU (Shaun)
Mon Aug 28 21:42:34 2017
X-Original-To: nanog@nanog.org
Date: Wed, 23 Aug 2017 23:21:28 -0500
From: Shaun <nanog@shat.net>
To: Erik Sundberg <ESundberg@nitelusa.com>
In-Reply-To: <495D0934DA46854A9CA758393724D590A5FD813E@NI-MAIL02.nii.ads>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Wed, 23 Aug 2017 20:09:49 +0000
Erik Sundberg <ESundberg@nitelusa.com> wrote:
> Which Google DNS Server Cluster am I using. I am testing this from Chicago, IL
>
> # dig o-o.myaddr.l.google.com -t txt +short @8.8.8.8
> "173.194.94.135" <<<<<<DNS Server IP, reference the list above to get the cluster, Council Bluffs, IA
> "edns0-client-subnet 207.xxx.xxx.0/24" <<<< Your Source IP Block
Worth noting, this record has TTL 60 and caching can cause unexpected
responses; you may have to try a few times to get the correct data. My
first attempt gave me an unrecognized "edns0-client-subnet" and a Google
IP from Finland when I was querying from Atlanta.
-s
