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

[sthaug at nethelp.no]

> > 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). I don't know the status for Microsoft and Apple.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no