On Sat, Apr 11, 2020 at 09:22:42AM -0400,
 Shumon Huque <shu...@gmail.com> wrote 
 a message of 138 lines which said:

> > The delegation (re)validation might be a reasonable place to
> > implement something to detect this and adjust the choice of NS on
> > the resolver's cache.
> 
> I think most resolvers do a bit of this today already. If they detect a
> broken delegation, they will mark that server as lame, and remove it from
> the candidate nameservers for the zone (for a certain period of time), and
> try another one.

I don't think that you answer Brian's idea. The way I've read his
idea, he suggested, when a resolver detects a lame server (or when all
servers are lame?), to go back to the parent and to ask again the NS
set, to see if there is a new and better list.


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