Anyone understand dhcpd and dynamic dns?

[Tom Horsley]

I thought I had this stuff all working for my virtual machines,
but from time to time the dns entries will disappear briefly
then reappear again in a few seconds. I find this nonsense in
my host machine's log (where I run dhcpd and named):

Jan 20 11:59:25 godzilla named[1885]: client 127.0.0.1#45745: signer "dhcp_updater" approved
Jan 20 11:59:25 godzilla named[1885]: client 127.0.0.1#45745: updating zone 'ccur.kvm/IN': deleting an RR
Jan 20 11:59:25 godzilla dhcpd: if ubuntu9d04x.ccur.kvm IN TXT "001c10aaa5809b2c89102e1ea65bc9f4dd" rrset exists and ubuntu9d04x.ccur.kvm IN A 192.168.118.127 rrset exists delete ubuntu9d04x.ccur.kvm IN A 192.168.118.127: success.
Jan 20 11:59:25 godzilla named[1885]: client 127.0.0.1#47954: signer "dhcp_updater" approved
Jan 20 11:59:25 godzilla named[1885]: client 127.0.0.1#47954: updating zone 'ccur.kvm/IN': deleting an RR
Jan 20 11:59:25 godzilla dhcpd: if ubuntu9d04x.ccur.kvm IN A rrset doesn't exist delete ubuntu9d04x.ccur.kvm IN TXT "001c10aaa5809b2c89102e1ea65bc9f4dd": success.
Jan 20 11:59:25 godzilla named[1885]: client 127.0.0.1#52473: signer "dhcp_updater" approved
Jan 20 11:59:25 godzilla named[1885]: client 127.0.0.1#52473: updating zone '118.168.192.in-addr.arpa/IN': deleting rrset at '127.118.168.192.in-addr.arpa' PTR
Jan 20 11:59:25 godzilla dhcpd: removed reverse map on 127.118.168.192.in-addr.arpa.
Jan 20 11:59:30 godzilla dhcpd: DHCPREQUEST for 192.168.118.163 from 54:52:00:03:92:dc (baserhev5d4i) via br0
Jan 20 11:59:30 godzilla dhcpd: DHCPACK on 192.168.118.163 to 54:52:00:03:92:dc (baserhev5d4i) via br0
Jan 20 12:00:03 godzilla named[1885]: client 127.0.0.1#43349: signer "dhcp_updater" approved
Jan 20 12:00:03 godzilla named[1885]: client 127.0.0.1#43349: updating zone 'ccur.kvm/IN': adding an RR at 'ubuntu9d04x.ccur.kvm' A
Jan 20 12:00:03 godzilla named[1885]: client 127.0.0.1#43349: updating zone 'ccur.kvm/IN': adding an RR at 'ubuntu9d04x.ccur.kvm' TXT
Jan 20 12:00:03 godzilla dhcpd: Added new forward map from ubuntu9d04x.ccur.kvm to 192.168.118.127
Jan 20 12:00:03 godzilla named[1885]: client 127.0.0.1#56612: signer "dhcp_updater" approved
Jan 20 12:00:03 godzilla named[1885]: client 127.0.0.1#56612: updating zone '118.168.192.in-addr.arpa/IN': deleting rrset at '127.118.168.192.in-addr.arpa' PTR
Jan 20 12:00:03 godzilla named[1885]: client 127.0.0.1#56612: updating zone '118.168.192.in-addr.arpa/IN': adding an RR at '127.118.168.192.in-addr.arpa' PTR
Jan 20 12:00:03 godzilla dhcpd: added reverse map from 127.118.168.192.in-addr.arpa. to ubuntu9d04x.ccur.kvm

Is this wacko time keeping in the virtual guest making dhcpclient expire the
lease sooner than the dhcp server can renew it?

Any other theories?

What is going on?

Thanks for any info you can provide.