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

[John Payne]

On Jul 14, 2006, at 1:36 PM, Brad Knowles wrote:

> At 9:39 AM -0400 2006-07-14, OndÞej Sur˜ wrote:
>
>>  It cannot happen if you don't advertise all addresses at any  
>> deployed
>>  node.  Which is the model UltraDNS took (as I understood from  
>> reply to
>>  my previous mails).
>
> In this case, I don't think that it is sufficient to be guaranteed of
> having at least two different sites servicing the same content.  You
> get back to the original question of whether or not they would have
> rolled out a gTLD with just two unicast addresses.

I'm just replying to this one... but HUH?  If you don't have any  
overlap at all, 100% anycast with 2 anycast blocks, you absolutely  
guarantee that you get two different sites servicing the same content.