servfail are not cached!

[Ben Croswell]

Actually he said the DNS protocol allows for it and ISC had been considering
adding it.

-Ben Croswell
On Sep 27, 2011 11:38 AM, "Issam Harrathi" <issamneo at gmail.com> wrote:
> As i test it's not cached at all, and you say here it's cached for 30
> seconds?!
> i'm using 9.7.2-P3.
>
> 2011/9/27 Evan Hunt <each at isc.org>
>
>> > I discover that servfail are not cached. is it normal?
>>
>> Yes, that's normal.
>>
>> Temporary negative caching of SERVFAIL responses for a limited period (up
>> to 30 seconds, if I recall correctly) is permitted by the DNS protocol,
>> and we've discussed implementing it in BIND9, but haven't had time yet.
>>
>> --
>> Evan Hunt -- each at isc.org
>> Internet Systems Consortium, Inc.
>>
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