Problem with ddns updates

[David W. Hankins]

On Tue, Sep 15, 2009 at 05:58:56PM +0200, stefan novak wrote:
> host testmodem2 { hardware ethernet 00:22:3A:DC:36:49; fixed-address
> 10.62.31.3; filename "test2.cm";
>                     ddns-hostname "testmodem2";
>                     ddns-domainname "cablemodem.net.";
>                     option host-name "testmodem2";
>                     option domain-name "cablemodem.net.";
> }

ddns updates are not generally performed for fixed-address host
records (generally referred to as 'static leases'), since those are
generally used in manual configurations (in which case it is easier
and more reliable to write the zone and dhcpd.conf information at the
same time rather than to dynamically update).

there isn't an expiration event on host records, so there's a zone
cleanup issue as well; all records you nail up will have to be
removed manually if the host record is ever removed.

if you've thought about that and decided you still want host records
with fixed-addresses updated, there's a config option to enable that
behaviour specifically ("update-static-leases").

-- 
David W. Hankins	"If you don't do it right the first time,
Software Engineer		     you'll just have to do it again."
Internet Systems Consortium, Inc.		-- Jack T. Hankins
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