dhcp deletes ddns entry

[Craig]

We have one machine (Linux: CentOS 4.4; dhclient v3.0.1) that has it's 
ip address dynamically allocated by dhcpd (v3.0.1). But, the DHCPREQUEST 
will trigger the DNS entry (via DDNS) to be deleted.

At 8:41, the client (CENTOS_CLIENT) appears to do a DHCPREQUEST, at 
which time the dhcpd server seems to verify that the RR does exists and 
then deletes it. (Shouldn't it do an update?)

Then the next time the client does a DHCPREQUEST (9:45), the RR does not 
exists and is, obviously, added.

But, in the interim, the client name does not exists in DNS.

I am running a slightly older version of dhcpd (3.0.1), but I can't find 
anything in the release notes that say this is fixed in 3.0.5. Also, 
some simple web searches did not find anything.

Any hints/thoughts?

 From the logs:

May 29 08:41:44 DHCP_SERVER dhcpd: if CENTOS_CLIENT.example.com IN TXT 
"TEXT_STRING" rrset exists and CENTOS_CLIENT.example.com IN A 
10.xx.xx.xxx rrset exists delete CENTOS_CLIENT.example.com IN A 
10.xx.xx.xxx: success.
May 29 08:41:44 DHCP_SERVER dhcpd: removed reverse map on 
xxx.xx.xx.10.in-addr.arpa.
May 29 08:41:44 DHCP_SERVER dhcpd: DHCPREQUEST for 10.xx.xx.xxx from 
aa:bb:cc:dd:ee:00 (CENTOS_CLIENT) via eth0
May 29 08:41:44 DHCP_SERVER dhcpd: DHCPACK on 10.xx.xx.xxx to 
aa:bb:cc:dd:ee:00 via eth0
May 29 09:45:50 DHCP_SERVER dhcpd: Added new forward map from 
CENTOS_CLIENT.example.com to 10.xx.xx.xxx
May 29 09:45:50 DHCP_SERVER dhcpd: added reverse map from 
xxx.xx.xx.10.in-addr.arpa. to CENTOS_CLIENT.example.com
May 29 09:45:50 DHCP_SERVER dhcpd: DHCPREQUEST for 10.xx.xx.xxx from 
aa:bb:cc:dd:ee:00 via eth0
May 29 09:45:50 DHCP_SERVER dhcpd: DHCPACK on 10.xx.xx.xxx to 
aa:bb:cc:dd:ee:00 (CENTOS_CLIENT) via eth0
May 29 14:20:06 DHCP_SERVER dhcpd: DHCPREQUEST for 10.xx.xx.xxx from 
aa:bb:cc:dd:ee:00 (CENTOS_CLIENT) via eth0
May 29 14:20:06 DHCP_SERVER dhcpd: DHCPACK on 10.xx.xx.xxx to 
aa:bb:cc:dd:ee:00 (CENTOS_CLIENT) via eth0
May 29 14:28:48 DHCP_SERVER dhcpd: if CENTOS_CLIENT.example.com IN TXT 
"TEXT_STRING" rrset exists and CENTOS_CLIENT.example.com IN A 
10.xx.xx.xxx rrset exists delete CENTOS_CLIENT.example.com IN A 
10.xx.xx.xxx: success.
May 29 14:28:48 DHCP_SERVER dhcpd: removed reverse map on 
xxx.xx.xx.10.in-addr.arpa.
May 29 14:28:48 DHCP_SERVER dhcpd: DHCPREQUEST for 10.xx.xx.xxx from 
aa:bb:cc:dd:ee:00 (CENTOS_CLIENT) via eth0
May 29 14:28:48 DHCP_SERVER dhcpd: DHCPACK on 10.xx.xx.xxx to 
aa:bb:cc:dd:ee:00 via eth0


TIA,
Craig