TTL?
Len Conrad
LConrad at Go2France.com
Mon May 21 14:51:40 UTC 2001
>Im getting a little confused looking at the BIND8 book of O'Reilly. It
>says that the 5th field of the SOA record is the TTL but why now you at
>the list refers to de time to live as $TTL? What difference have the
>$TTL directive and the field of the SOA record?
$TTL default applies to all RR´s that don´t have explicit TTL. Explicit RR
TTL override the default
The last field of the SOA is the "m-ttl", which meant originally "minimum
TTL" but whose current usuage is now "negative TTL". ie, how long the most
recent BIND8, 9 cache a negative answer for the zone.
IIRC, the hard maximum for "n-TTL" is 3H.
Len
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