In message <950.42549...@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
> If the remote DNS query for this record just after 'nsupdate delete', then it
> will get nothing and cache this nonexist record for some time, even though t
> he correct record has been added. How to deal with this case?
Not if you use nsupdate correctly.
> Thanks.
>
> Regards,
> Wah.
>
>
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--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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