DNS cache time to live

Mark.Andrews at nominum.com Mark.Andrews at nominum.com
Mon Mar 13 22:53:07 UTC 2000

	All DNS records have a Time To Live (TTL) field.  This specifies
	the maximum time for how long a record will live in a cache.

	On the master server records either have an explict TTL or inherit
	it from the SOA minimum field or the TTL directive.

		example	3600	IN	A


		$TTL 3600
		example		IN	A

	In general the old record should disappear after SOA refresh +
	TTL.  The SOA refresh is how long it should take the slaves to
	update their copy of the zone.


> How long a DNS client cache remain active? For example if I change
> a workstation address at DNS server, how many time the client need
> to update the cache?? There is any parameter to adjust this time??
> I'm using bind 8.1.2 with Solaris 2.7.
> Thanks in advance,
> Marcelo Camargo
> CETELEM - Brasil - SP
Mark Andrews, Nominum Inc. / Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com

More information about the bind-users mailing list