From owner-freebsd-questions  Wed Jan 26  8:49:52 2000
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To: Veaceslav Revutchi <sl@dnt.md>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: No default TTL & CNAME and OTHER data error 
In-reply-to: Your message of "Wed, 26 Jan 2000 11:56:58 +0200."
             <Pine.BSF.4.10.10001261143410.48097-100000@zeus.dnt.md> 
Date: Wed, 26 Jan 2000 08:49:32 -0800
From: "Kevin Oberman" <oberman@es.net>
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8.2 releases of BIND implement new RFCs which mandate that the minimum
TTL in the SOA really be used as minimum TTL. This is very significant
for negative caching. As a result, this value should not be used for
the default TTL and a new directive to specify the default has been
added.

You probably want to do the following:
1. Insert the line "$TTL 1D" before the SOA in every zone file.
2. Change the minimum TTL in the SOA to a value more appropriate to a
   real minimum, say 600 or 900.

Once this is done, the $TTL will be used as default for all records
not containing an explicit TTL and the SOA minimum TTL value will be
used as the TTL for negative entries and as the actual minimum TTL. In
previous versions of BIND these (true minimum and negative cache TTLs)
were hard coded.

Minimum TTL does not preclude setting the TTL for one or more records
to zero. This means that the server should never cache the
records. But a non-zero value below minimum will be replaced by the
minimum. 

R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634


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