Need help debugging negative caching
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Mon Sep 2 20:51:56 UTC 2002
>
> Mark_Andrews at isc.org wrote in message news:<akoqqr$29k8$1 at isrv4.isc.org>...
> >
> > The fact that it is using it as the default TTL doesn't mean that
> > it can't emit negative answers with the TTL you want.
> >
> > Just set the MINIMUM field to the TTL you want on the negative
> > answers. Use this TTL on the SOA. Set explict TTLs on all the
> > other records to the old MINIMUM value.
> >
> > Setting the MINIMUM field will allow slaves that talk RFC 2308 to
> > do the right thing. Setting the SOA TTL will get the non RFC 2308
> > server to hand out the right TTL. Setting explict TTLs on the other
> > records will allow all servers to return the TTL you want for the
> > forward records.
> >
> > Mark
>
> Good point, but I couldn't set explicit TTLs because the RRs were
> generated dynamically by DHCP.
The DHCP server will be setting explict TTLs in the update
requests.
> In short, what I needed was an
> alternate way to set the TTL without using the MINIMUM field. Finally,
> I've found out that my non RFC 2308 server has a "defTTL" parameter
> that can be set on a zone per zone basis, and that overrides the
> MINIMUM field of the SOA. With that, I can follow your suggestion, and
> get "sort of" RFC 2308-compatibility.
>
> Thanks everybody for your help.
>
> Joan
>
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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