about cache nonexist record

[Tech W.]

--- On Tue, 21/7/09, Mark Andrews <marka at isc.org> wrote:

> From: Mark Andrews <marka at isc.org>
> Subject: Re: about cache nonexist record
> To: "Tech W." <techwww at yahoo.com.cn>
> Cc: bind-users at lists.isc.org
> Received: Tuesday, 21 July, 2009, 8:01 AM
> 
> In message <950.42549.qm at web15608.mail.cnb.yahoo.com>,
> "Tech W." writes:
> > 
> > Hello,
> > 
> > I have Bind-9.6.1 running on our university
> environment, have been using dyna
> > mic update.
> > 
> > My question is, when other DNS query my named for a
> record, for example test.
> > example.com, but this record doesn't exist. How long
> time will the remote DNS
> >  cache this nonexist record?
> 
>     For up to as long as you have told it
> too.  The SOA minumum is
>     used to set the timer.
>  
> > I found the problem that if this nonexist record was
> cached by remote DNS, ev
> > en if I added the corresponding record to named zone
> soon, the remote DNS can
> > 't find it quickly.
> > 
> > This is not good for dynamic update IMO, for example,
> I need to change a reco
> > rd, then I have to do:
> > 
> > nsupdate delete ....
> > nsupdate add ....
> 
>     Well do it in one transaction.
> 
>     nsupdate
>     update delete ...
>     update add ...
>     send
> 



Thanks Mark and all.
Can I ask how to call nsupdate in Perl language?
I know some Perl but not good at it.

Thanks.

Regards,
Wah.


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