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

[David Conrad <drc () virtualized 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