From: kevin lyda (kevin at domain suberic.net)
Date: Thu 26 Aug 1999 - 15:07:52 IST
Kenn Humborg spoke thusly:
>Aug 26 13:12:16 cerberus named[194]: ns_forw: \
> query(22.8.203.140.in-addr.arpa) \
> A RR negative cache entry (MIDIR.UCD.IE:) \
> learnt (NODATA=134.226.1.114:NS=198.41.0.4)
>I've been getting a lot of them recently referring to midir.ucd.ie and
>in-addr.arpa lookups in UCG's address range.
>
>What's a 'negative cache entry'? (My BIND book is not available
>right now...)
if you have a redhat system, check the bind docs in /usr/doc/bind*
if not, rfc's 1034, 1035, 1122, 1123, 1536, 1713, 2181, and 2308.
start with the latter from the looks of it. in essence the negative
cache tracks negative responses to dns queries. www.isc.org is
the source for bind, so there might be docs there.
be aware i'm not a dns expert, nor do i play one on mailing lists.
until your post i was unaware of ncaches (good idea though).
kevin
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