Question on documentation (TTL or not TTL, that is the question....)

[Mark.Andrews at nominum.com]

	It's a comment stating the name of the field.

	We could change it and in doing so break scripts that are
	looking for the word minimum.

	BIND used the "minimum" field as a default ttl, not as a minimum,
	so it was already a misnomer.

	Mark
	
> 
> > 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
> 
> 
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com