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

Florian Weimer fw at deneb.enyo.de
Wed Jul 19 09:42:59 UTC 2006

* >> > 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.

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