Reasonable default values for bind?

[Mark_Andrews at isc.org]

	Firstly please use a valid email address (not yan at oberon.cardinal.lan).

> 
> I am using bind versions from 8.x to 9.2.  I'd like to get some concensus
> of what reasonable defaults are.
> 
> Right now I am using the defautls that came with my RedHat system:
> 
> @       86400           IN      SOA     oberon.cardhome.lan. bind.cardhome.la
> n. (
>                         2007022701 ; serial
>                         28800 ; refresh
>                         14400 ; retry
>                         86400 ; expire
>                         86400 ; default_ttl
>                         )
> 
> and on starting, I get the following warning:
> 
> Dec 16 06:33:25 oberon named[28175]: cardhome.hosts: WARNING SOA expire value
>  is less than refresh + 10 * retry (86400 < (28800 + 10 * 14400))
> Dec 16 06:33:25 oberon named[28175]: cardhome.hosts: WARNING SOA expire value
>  is less than 7 days (86400)


	The *expire* field is ridiculously small.  It would normally be of
	at least a week if not several months.  Adjust the expire field and
	the warnings will go away.

	Mark
> 
> Any suggestions?  I want to set TTL as long as is reasonable - my various
> servers are tied together using less-than-dependable WAN and I don't want
> to lose DNS resolution in a cluster just because the WAN goes down for a
> few hours.
> 
> Thanks,
> 
> --Yan
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org