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

[Florian Weimer]

* >> > What happens to the packets for the down unicast server?
>> 
>> They cease to be sent. 8-) AFAIK, most DNS resolvers keep track which
>> servers are down (or are lame) and query them only occasionally, to
>> see if the problem still persists.  Some of them even store the RTT.
>
> As far as I know this is *not* true for many stub resolvers (e.g. your
> typical Unix libresolv).

Ah, good point.  I had authoritative name servers on my mind, despite
the subject of the thread.  Resolvers face very different issues.