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

[David Tonhofer]

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)?

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)

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)

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)
                                )
---------------------

So, who's right (*confused*)


				-- David Tonhofer
				dev/sysop monster.lu & luxjob.lu