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

Mon May 28 19:32:29 UTC 2012

On Tue, May 29, 2012 at 12:21:10AM +0530,
 Anurag Bhatia <me at anuragbhatia.com> wrote 
 a message of 28 lines which said:

> I know few registry/registrars which do not accept both (or all)
> name servers of domain name on same subnet.

Since my employer is one of these registries, let me mention that I
fully agree with David Conrad here.

On Tue, May 29, 2012 at 12:54:01AM +0530,
 Anurag Bhatia <me at anuragbhatia.com> wrote 
 a message of 42 lines which said:

> 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.

You will address *some* failure modes with this setup but not
all. Again, see David Conrad's examples of a fat finger adding your
prefix in a route-map.