DDNS updates with primary and secondary server

Andre Schubert andre at km3.de
Wed Jun 17 08:37:31 UTC 2009

Hi all,

iam playing a little bit with ISC dhcp-3.0.1 and dhcp-3.0.5 and DDNS updates.
These are the snippets from my config:

    key DHCP_UPDATER {
         algorithm hmac-md5;
         secret "<SECRET>";

    zone cpes.local. {
         key DHCP_UPDATER;

DDNS updates to the primary works perfectly.
But when the primary goes down, then the secondary isnt used anymore and
dhcpd logs a time out.
I also see no packets with a packet sniffer going to

>From the docs in dns.c i read, that the DDNS updates should be performed on
the secondaries if the primary timed out.
Iam doing something wrong?
Or does this not really work with these versions?

Best regards,
Andre Schubert
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