[153020] in North American Network Operators' Group
Re: DNS anycasting - multiple DNS servers on same subnet Vs
daemon@ATHENA.MIT.EDU (Anurag Bhatia)
Mon May 28 15:24:34 2012
In-Reply-To: <alpine.LSU.2.00.1205282018370.5807@hermes-2.csi.cam.ac.uk>
Date: Tue, 29 May 2012 00:54:01 +0530
From: Anurag Bhatia <me@anuragbhatia.com>
To: Tony Finch <dot@dotat.at>
Cc: NANOG Mailing List <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Tue, May 29, 2012 at 12:50 AM, Tony Finch <dot@dotat.at> wrote:
> Anurag Bhatia <me@anuragbhatia.com> wrote:
> >
> > One small concern I wanted to discuss here. 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).
> >
> > How one can deal with such case in case of anycasting setup which using
> > one single subnet everywhere?
>
> You still want name servers on more than one subnet in case the anycast
> setup breaks.
>
> I am building redundancy within that setup. I mean it will be software
based BGP so if hardware if fried up, it will break BGP session and pull
off routes anyway and for cases like DNS server (software) failure, I will
monitor it via simple bash script which can turn bgp daemon down. So once
it is off, routing tables should take it to different node.
> Tony.
> --
> f.anthony.n.finch <dot@dotat.at> http://dotat.at/
> South Utsire: Northwesterly 6 to gale 8 decreasing 4 or 5. Moderate or
> rough.
> Fair. Good.
>
--
Anurag Bhatia
anuragbhatia.com
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