Question on documentation (TTL or not TTL, that is the question....)
Cricket Liu
cricket at VeriSign.com
Sun Mar 4 21:36:12 UTC 2001
> Question on documentation....
>
> I've been reading DNS&BIND 3rd edition (I understand the 4th is not yet
off
> the presses). There seems to be a bit of a clash in the SOA record
> definition.
> Did it change from BIND8 to BIND9 (can't imagine)?
No, it changed between BIND 8.1.2 and 8.2, when RFC 2308
was published.
> On p.90 the Book says that the last value in the SOA record is the
'minimum
> TTL'
> which is described as the minimum time a record lives in a caching
server's
> cache (which is also what http://www.ietf.org/rfc/rfc1035.txt says)
That edition of the book covers BIND 8.1.2.
> The BIND9 documentation says that the last field in the SOA is the
negative
> caching TTL, which controls how long other servers will cache NXDOMAIN
> responses from the server. (This can be found in paragraph 6.3.3 of the
> admin manual)
That's currently correct, and what you'll find in the fourth edition of
the book.
> Slave BIND 9 name servers create database files which are commented like
> this, thus giving credence to RFC1035:
>
> taxi.lu IN SOA dns1.synapse.lu. dnsadmin.synapse.lu. (
> 2001020501 ; serial
> 28800 ; refresh (8 hours)
> 7200 ; retry (2 hours)
> 604800 ; expire (1 week)
> 3600 ; minimum (1 hour)
> )
That must be an oversight.
cricket
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