I believe that RFC 2308 redefines the SOA "minimum" field to be
"negative ttl"
If I create a dynamically updated zone file that looks like so:
[begin]
$ORIGIN .
$TTL 500
new.com IN SOA d62.test.com. hostmaster.d62.test.com. 2013012301 10800 3600
604800 86400
new.com IN NS d62.test.com.
[end]
When a DNS update comes into to add or modify a record and bind eventually
re-writes
the master file it will rearrange the SOA and add comments (which is fine) but
it labels
the last field as "minimum"
[begin]
$ORIGIN .
$TTL 500 ; 8 minutes 20 seconds
new.com IN SOA d62.test.com. hostmaster.d62.test.com. (
2013012302 ; serial
10800 ; refresh (3 hours)
3600 ; retry (1 hour)
604800 ; expire (1 week)
86400 ; minimum (1 day)
)
NS d62.test.com.
$ORIGIN new.com.
a A 1.2.3.4
[end]
Is there a reason for this or is it just a hold over?
It is perpetrating a misconception that this is the minimum TTL.
Thanks
--
Jack Tavares
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