BIND 9 and TTLs

[Cricket Liu]

> Joseph S D Yao wrote in message
> <20000920194339.U12272 at washington.cospo.osis.gov>...
> >
> >On Wed, Sep 20, 2000 at 09:55:13PM +0000, The infamous Brian" wrote:
> >...
> >> Why now require yet another TTL directive when one exists in the SOA?
Is
> it
> >
> >There is none in the SOA.  That has become the negative-caching TTL.
> >
> >TTLs are kept with each RR.  The "default" is now in the $TTL ...
> >statement.
> >
> >> not true that only one TTL directive is true for the zone? Is it not
true
> >
> >No, it is per resource record.
> >
> >> that the individual records are not subject to updates, that the whole
> zone
> >> is updated?
> >
> >No.  Individual records' TTL can be changed.
> >
> >If you mean something different, there is also such a thing as an
> >incremental zone transfer - pass only the records that have changed.
>
> Guess I better chuck the cricket book (2 ed.) because my information is
> soooo out of date!

All of Joe's information about setting the TTL on an individual record
is *all* editions of "DNS and BIND."  The $TTL control statement will
be covered in the fourth edition.

cricket