[isp-dns] Re: Should I have to restart BIND for updates?

[Michael Loftis <mloftis@...]

You don't really have much control over how long a 'positive authoritative' 
response is cached.  That's determined by the TTL and/or SOA values for the 
other domain.  Thats why we always tell customers it will take atleast 48 
hours for changes to show, and in some cases upwards of a week.

--On Wednesday, November 20, 2002 11:19 AM -0600 Chris Clements 
<jclements@...> wrote:

> 	We were not any sort of authority for that domain.  I should not have to
> restart DNS every time a completely unrelated domain changes hosts.  How
> would I even have known, had one customer not been trying to access the
> new host?  Perhaps my cache TTL should be shortened?
>
> I think something was wrong.  Perhaps I am just a pessimist.
>
> Chris
>
>
> //Actually, it sounds completely normal.  Name servers cache records
> they've //retrieved recently and then keep them in the cache, typically
> until the //record's TTL expires.  You just changed a record that was
> already cached on
> //your name server, but wasn't cached (hadn't been looked up recently) on
> any
> //of the other name servers you checked.
>
> //Restarting your name server abruptly cleared the server's cache and
> 'forced'
> //retrieval of the changed record.
>
> //Cheers,
> //Paul



>