Date: Wed, 2 May 2001 20:07:29 +0100 From: Mark Drayton <mark.drayton@4thwave.co.uk> To: freebsd-questions@freebsd.org Subject: Re: Named resolver trouble Message-ID: <20010502200729.A3273@tethys.valhalla.net> In-Reply-To: <5.1.0.14.0.20010502103806.026a2110@mail.Go2France.com>; from LConrad@Go2France.com on Wed, May 02, 2001 at 10:41:37AM %2B0000 References: <20010502163006.A32702@tethys.valhalla.net> <5.1.0.14.0.20010502103806.026a2110@mail.Go2France.com>
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Len Conrad (LConrad@Go2France.com) wrote:
> >from nyx. Does the resolver not query the authoritative server until
> >the zone TTL expires?
>
> When the BIND8 zone master determines that that a zone´s SOA serial
> number has changed, it will NOTIFY all NS hosts, and ALSO-NOTIFY
> hosts.
So can I add an also-notify { <resolver IP>; }; option in named.conf on
my authoritative servers to make the resolver update it's cache? The
BIND docs suggest NOTIFYs tell slaves that the zone file has changed on
the master and that they should update their own. I didn't think a
resolving-only nameserver used AXFR to get it's data.
I'm still not sure how a resolver deals with changed zone files.
For example, say my resolver has been running for a while and has built
up a cache of answers including some for example.com. example.com then
add a new A record to the example.com. zone like so:
an IN A 10.10.10.10
If somebody asks my resolver for the IP of an.example.com. should the
resolver:
a) determine an.example.com. isn't in it's cache (as example.com just
added it) and go off to find it (which I would imagine is correct)
or b) wait for the minimum cache time set in example.com's SOA to expire
before it goes to look for the record
If the first is correct (which seems most plausible) something is broken
with my DNS setup as it's not doing that right now. If I ask my resolver
for an.example.com it tells me it's non existant. If I ask example.com's
NSes they tell me the real answer.
Thanks again,
--
Mark Drayton
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