[153063] in North American Network Operators' Group
Re: DNS anycasting - multiple DNS servers on same subnet Vs
daemon@ATHENA.MIT.EDU (Stephane Bortzmeyer)
Tue May 29 06:36:30 2012
Date: Tue, 29 May 2012 12:34:51 +0200
From: Stephane Bortzmeyer <bortzmeyer@nic.fr>
To: Brett Frankenberger <rbf+nanog@panix.com>
In-Reply-To: <20120528235629.GA23276@panix.com>
Cc: NANOG Mailing List <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Mon, May 28, 2012 at 06:56:29PM -0500,
Brett Frankenberger <rbf+nanog@panix.com> wrote
a message of 15 lines which said:
> How does your employer know if two nameservers (two IP addresses) are
> on the same subnet?
The current heuristic for IPv4 is "belongs in the same /28" (and /64
for IPv6). Otherwise, Mark Andrews is right, we should use a BGP feed
but it would be complicated for a command-line tool.
