Evan Hunt <e...@isc.org> wrote:

> On Wed, Mar 11, 2015 at 12:13:42PM +0000, Tony Finch wrote:
> > These are signed zones so the answer has to validate.
>
> ... they are?  I thought the proposal was to restrict/deprecate
> qtype=ANY for all zones, not just signed ones.

At least some of them are signed :-) But you are right it needs to work
for unsigned zones.

NOERROR/NODATA responses to ANY will not work well.

I did a quick test consisting of:

dig any non.terminal # initially empty
(echo 'update add non.terminal 3600 in txt "braaains"';
 echo send) | nsupdate -l
dig txt non.terminal

For both signed and unsigned zones, the first query make BIND create a
negtive cache entry which covers all types, so it doesn't recurse for the
second query.

This will make qmail fail deliveries with a permanent error.

Tony.
-- 
f.anthony.n.finch  <d...@dotat.at>  http://dotat.at/
South Utsire, Forties, Cromarty, Forth, Tyne, Dogger: Southerly or
southeasterly 6 to gale 8, occasionally severe gale 9 in Forties, Cromarty and
Forth, becoming variable 4 for a time. Moderate or rough, occasionally very
rough at first in Forties, Cromarty and Forth. Rain for a time. Good, becoming
moderate or poor for a time.

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