Re: named setup problems
Jeff Schreiber wrote:
> "Jens B. Jorgensen" <jjorgens@bdsinc.com> writes:
> >I believe it makes a lot more sense to find out *what* names are being looked
> >up and *why* and solve the real problem rather than shoehorn in some kludge.
>
> I knew there was something I was forgetting to mention!
>
> >As I said, logically you only need to look up "external" names when you're
> >connected to the net. Otherwise you won't need to. It sounds like you need
> >to set up your own zone for carpanet. If you haven't done this then this is
> >most likely why you're seeing the problem.
>
> *nod* that's what I was suspecting. If you don't have _any_ internal
> name service [serving your local names and going to the root for names
> it doesn't know], then as long as you don't type names that your server
> doesn't know when your not connected you won't see a delay.
>
> If you _don't_ have an internal server, and your just using /etc/hosts
> to serve your internal names, and your resolvers point to external
> nameservers, the query will go to the external name server, and then
> resolve from /etc/hosts if the external doesn't answer... that's where
> the time delay comes in. [I know in one of the VMS products I'm responsible
> for we allow for control of the ordering of the local lookups vs. the
> remote lookups, but that's something I've not gotten around to writing
> up and recommending to ISC, and I havn't had time to analyse the BIND 8
> resolver to see if the funky changes in there allow for changing the
> resolving order].
Ah yes, but I suspect that it's name queries from machines other than the linux box
which are contributing to the problem. In this case editing /etc/hosts and
/etc/resolv.conf won't help since named doesn't use these files at all. Actually,
my best guess is that the problem is two-pronged. Stephen mentioned that smbd was
hanging waiting for a name queries and like so often is the case, the difficulty is
that smbd wants to log a message to syslog with the name of the host connecting and
is doing a gethostbyaddr on the IP address of a windoze client. If he doesn't have
an entry in /etc/hosts (or entries in /var/named/XXX) for these hosts then the
query will be forwarded out to external named's. That's why I'm suggesting a course
of action where the first step is to set up a named database with all the hosts and
then use logging (specify 'options query-log' in /var/named/boot.options --thanks
for catching my typo Jeff!) to see what queries are going out to the net.
I myself had a similar problem which vexed me for some time. I thought I had a
complete database until I realized I was using 127.0.0.2 and 127.0.0.3 for diald
but had not defined names for these IPs anywhere. Doh!
--
Jens B. Jorgensen
jjorgens@bdsinc.com
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