How to adjust TTL ?
barmar at alum.mit.edu
Thu Jun 9 02:22:06 UTC 2005
In article <d884sl$2e8i$1 at sf1.isc.org>,
"Sylvan Andrew" <sylvan_nids at norfolk.nf> wrote:
> Could somebody please point this newbie in the right direction ?
> Where in named do I configure the TTL for resolved addresses ? For example
> if I ping www.google.com our DNS server resolves the address and everything
> is fine. But if I ping www.google.com again say after 2 hours of the first
> resolution it has to go off and resolve the IP again. Is that normal ? I
> would prefer for various network reasons it kept the first record it found
> in it's own table for at least 8 hours. Could somebody please tell me how to
> achieve this ?
You can't. If Google says you should only cache the record for 5
minutes, you mustn't ignore them. They need to be able to change their
records and know that after 5 minutes they can shut down the old servers
without causing problems because some idiot decided to hold on to that
address for the better part of a day.
You can configure a max-ttl, so that you'll clean out records faster,
but you can't configure BIND to hold on to records longer than the owner
Barry Margolin, barmar at alum.mit.edu
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