DDNS updates fail after moving server

Robert C. Drye Robert.C.Drye at hitchcock.org
Tue Apr 24 19:01:58 UTC 2012

We recently moved our DHCP-3.0 configuration to DHCP-4.2.3-P2 on new hardware but with the same IP address.  Updates are done against the same DNS server. We get this kind of message in the log (addresses changed to protect the innocent...).  There is no rndc key in use.  Manual updates using nsupdate from the dhcpd server work fine.  BIND version on DNS server is 9.7.5 .

Apr 24 14:55:42 dhcpd dhcpd: Unable to add forward map from T7CL43626.dhcp.hitchcock.org. to not found.

Here are some relevant snips from dhcpd.conf

ddns-update-style interim;
ignore client-updates;
do-forward-updates on;

And in the zone:

        subnet netmask {
                pool {
                        range ;
                        deny members of "ras-clients";
                option broadcast-address ;
                option routers ;
                option domain-name "hitchcock.org" ;
                option domain-name-servers, ;
                option netbios-name-servers, ;
                option netbios-node-type 8 ;
                ddns-domainname "dhcp.hitchcock.org.";
                ddns-rev-domainname "in-addr.arpa.";
                default-lease-time 7200;
                max-lease-time 7200;


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