rndc flushname not working

[Frank Even]

Is there any place I can look to get a definitive answer in what cases
"flushname" will and will not work?  I've been digging around in lists
and docs and can't seem to find any definitive answers.  I've been
having odd troubles clearing a name from a cache and after even
clearing the name and the name that the name servers was attached to,
still had to flush the entire cache to get resolution working properly
on that domain again.

Thanks,
Frank

On Tue, Dec 9, 2014 at 8:31 PM, Mark Andrews <marka at isc.org> wrote:
>
> Nameservers being down does not result in NXDOMAIN responses.  I
> suspect that some of the auth servers were producing NXDOMAIN
> incorrectly.   Flushing the name won't help in those cases.
>
> In message <001001d01429$1c857f70$55907e50$@iname.com>, "Frank Bulk" writes:
>> Our ISP operations are running a mixture of 9.7.3 and 9.8.4 on several
>> Debian servers and we've noticed that rndc flushname doesn't work many
>> times.
>>
>> This weekend we had a local institution whose own authoritative DNS servers
>> [all of them] were offline for 48+ hours and so there were several
>> negatively cached entries in our resolvers' caches from customers who were
>> querying for their institutions website and MX record.  After the
>> institution restored connectivity to their DNS servers this afternoon I
>> checked all our resolvers and a few returned NXDOMAIN for the www and MX
>> record.  Issuing rndc flushname <domain> and rndc flushname <www.domain>
>> didn't clear out the NXDOMAIN.  I had to use "rndc flush" to resolve the
>> issue.
>>
>> Is this expected behavior?  The next time I see what, what troubleshoot
>> steps should I take diagnose the issue?  Dump the DB?
>>
>> Frank
>>
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> Mark Andrews, ISC
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> PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org
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