what does "max-ncache-ttl 0;" mean?

[blrmaani]

On Tuesday, March 1, 2016 at 11:34:09 PM UTC-8, A. Renald Niswady wrote:
> hehehe,
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> http://www.zytrax.com/books/dns/ch7/hkpng.html#max-ncache-ttl
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> i found zytrax site is really helpful
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> Regards
> -Renald-
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> From: "John W. Blue" <john... at rrcic.com>
> To: "A. Renald Niswady" <rena... at orion.net.id>, "blrmaani" <blrm... at gmail.com>
> Cc: comp-protoc... at isc.org
> Sent: Wednesday, March 2, 2016 2:27:49 PM
> Subject: RE: what does "max-ncache-ttl 0;" mean?
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> Now quote your source.
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> ;)
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> From: bind-user... at lists.isc.org [mailto:bind-user... at lists.isc.org]
> On Behalf Of A. Renald Niswady
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> Sent: Wednesday, March 02, 2016 1:23 AM
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> To: blrmaani
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> Cc: comp-protoc... at isc.org
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> Subject: Re: what does "max-ncache-ttl 0;" mean?
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> max-ncache-ttl sets the maximum time (in seconds) for which the server will cache negative (NXDOMAIN) answers
>  (positives are defined by 
> max-cache-ttl). The default max-ncache-ttl is 10800 seconds (3 hours). max-ncache-ttl cannot exceed 7 days and will be silently truncated to 7 days if set to a greater value. This statement may be used in
> view or a global 
> options clause.
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> Regards,
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> A. Renald Niswady
> 
> [NOC-System] Orion Cyber Internet
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> PT Orion Cyber Internet
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> From:
> "blrmaani" <blrm... at gmail.com>
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> To: comp-protoc... at isc.org
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> Sent: Wednesday, March 2, 2016 2:13:29 PM
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> Subject: what does "max-ncache-ttl 0;" mean?
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> man pages for named.conf says "max-ncache-ttl <integer>" and only talks about default values and max values - no mention of minimum-value.
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> Does "max-ncache-ttl 0;" mean never cache negative queries (queries resulting in NXDOMAIN) or does it mean cache negative queries forever?
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> Too lazy to test this option or look bind code :), hence posting here - apologies in advance..!!
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> Blr
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No definite answer anywhere when value is set to 0