[195612] in North American Network Operators' Group
RE: Google DNS --- Figuring out which DNS Cluster you are using
daemon@ATHENA.MIT.EDU (Erik Sundberg)
Mon Aug 28 21:27:33 2017
X-Original-To: nanog@nanog.org
From: Erik Sundberg <ESundberg@nitelusa.com>
To: Shaun <nanog@shat.net>
Date: Thu, 24 Aug 2017 04:41:21 +0000
In-Reply-To: <20170823232128.99DA.B2447BB2@shat.net>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
Shaun, Good catch!!!
I would be nice if this was lowered to 1 second.
#dig o-o.myaddr.l.google.com -t txt @8.8.4.4
;; ANSWER SECTION:
o-o.myaddr.l.google.com. 51 IN TXT "74.125.80.4"
o-o.myaddr.l.google.com. 51 IN TXT "edns0-client-subnet 14.161=
.5.0/24" <<< Not my ip but someone from this IP did query this 9 seconds =
ago.
-----Original Message-----
From: Shaun [mailto:nanog@shat.net]
Sent: Wednesday, August 23, 2017 11:21 PM
To: Erik Sundberg
Cc: nanog@nanog.org
Subject: Re: Google DNS --- Figuring out which DNS Cluster you are using
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 l=
ist 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 respo=
nses; you may have to try a few times to get the correct data. My first att=
empt gave me an unrecognized "edns0-client-subnet" and a Google IP from Fin=
land when I was querying from Atlanta.
-s
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