[dns-operations] Load balancing DNS queries across many machines

[Michael C. Toren]

On Thu, Jul 16, 2009 at 05:48:19PM -0700, Michael Sinatra wrote:
> >Do they anycast individual machines and
> >just rely on multipath routing to load balance, or put all of the
> >machines on the same network and use VRRP or CARP, or do any sites use
> >higher level protocols for load balancing?
> 
> anycast + equal-cost multipath routing via an IGP such as OSPF or IS-IS. 
> UC Berkeley has been doing this since 1999.  I am sure there are others 
> who have been doing it longer.

When using equal-host routing, presumably you're also using per-path
load-balancing, rather than per-packet load-balancing, in order to
support TCP queries?

Can you tell us how many hosts you're using equal-host routing to?

Thanks,
-mct