DNS anycasting - multiple DNS servers on same subnet Vs registrar/registry policies

Mon May 28 19:24:01 UTC 2012

On Tue, May 29, 2012 at 12:50 AM, Tony Finch <dot at dotat.at> wrote:

> Anurag Bhatia <me at 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 at 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
or simply - http://[2001:470:26:78f::5] if you are on IPv6 connected
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