[153018] in North American Network Operators' Group
Re: DNS anycasting - multiple DNS servers on same subnet Vs
daemon@ATHENA.MIT.EDU (David Conrad)
Mon May 28 15:19:12 2012
From: David Conrad <drc@virtualized.org>
In-Reply-To: <CAJ0+aXabEt=3eG-JFH1TXXWGS3JsnuAtqzQuGA78bj-6oxAgMQ@mail.gmail.com>
Date: Mon, 28 May 2012 12:18:32 -0700
To: Anurag Bhatia <me@anuragbhatia.com>
Cc: NANOG Mailing List <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Anurag,
On May 28, 2012, at 11:51 AM, Anurag Bhatia wrote:
> I know few registry/registrars
> which do not accept both (or all) name servers of domain name on same
> subnet. They demand at least 1 DNS server should be on different =
subnet for
> failover reasons (old thoughts).
IMHO appropriately so. The fact that anycast allows for multiple =
(potentially) geographically distributed machines to respond to DNS =
queries does not remove the value of having multiple prefixes for DNS =
servers. Single points of failure are generally bad. Imagine the =
scenario where someone makes a booboo and accidentally filters your =
single anycast prefix...
Regards,
-drc
