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

[John Payne]

Brad, Nicholas

I think the thing that's really breaking your understanding is that  
you both have the assumption that every anycast pod has to announce  
the all the service addresses.

If you think of every anycast service address as a seperate cloud,  
does that help?

UltraDNS muddies the water somewhat by having different overlaps  
points between different clouds, which may or may not lead to the  
failure mode you're both describing.  If it does, that is a failure  
of UltraDNS's deployment, NOT a failure of anycast.

All of the root servers could be anycasted and as long as they don't  
all show up at the same NAPs, you still have the redundancy you see  
today with a mix.