[dns-operations] Too Open (Was: OpenDNS makes your Internet work better

[Stephane Bortzmeyer]

On Mon, Jul 10, 2006 at 01:53:58PM -0700,
 Rick Wesson <wessorh at ar.com> wrote 
 a message of 36 lines which said:

> The ORNs discussed in the papers you reference below are for the
> most part ones that are open but not managed as open. ie their
> managers think that they are closed but in fact are not. These [in
> mass] do pose a threat.
> 
> OpenDNS is supposed to be open, its in their name. The ORNs are not
> supposed to be open but that are.

Correct but what does it change in practice. OpenDNS knows that
it is open, but how does it make it less vulnerable?

Do they implement rate-limiting, for instance?