I can confirm this issue on Gutsy Gibbon (7.10, amd64).  The /var/log/messages has frequent entries of this sort:

Nov 30 09:15:08 skiweber dhcdbd: message_handler: message handler not found under /com/redhat/dhcp/eth0 for sub-path eth0.dbus.get.reason
Nov 30 09:15:08 skiweber dhcdbd: dhco_input_option: Value 3650722200 cannot be converted to type L 
Nov 30 09:15:08 skiweber dhcdbd: dhco_parse_option_settings: bad option setting: old_dhcp_rebinding_time = 3650722200 
Nov 30 09:15:08 skiweber dhcdbd: dhco_input_option: Value 4294967295 cannot be converted to type L 
Nov 30 09:15:08 skiweber dhcdbd: dhco_parse_option_settings: bad option setting: old_dhcp_lease_time = 4294967295 
Nov 30 09:15:16 skiweber dhcdbd: dhco_input_option: Value 3650722200 cannot be converted to type L 
Nov 30 09:15:16 skiweber dhcdbd: dhco_parse_option_settings: bad option setting: old_dhcp_rebinding_time = 3650722200 
Nov 30 09:15:16 skiweber dhcdbd: dhco_input_option: Value 4294967295 cannot be converted to type L 
Nov 30 09:15:16 skiweber dhcdbd: dhco_parse_option_settings: bad option setting: new_dhcp_lease_time = 4294967295 
Nov 30 09:15:16 skiweber dhcdbd: dhco_input_option: Value 4294967295 cannot be converted to type L 
Nov 30 09:15:16 skiweber dhcdbd: dhco_parse_option_settings: bad option setting: old_dhcp_lease_time = 4294967295 
Nov 30 09:15:16 skiweber dhcdbd: dhco_input_option: Value 3650722200 cannot be converted to type L 
Nov 30 09:15:16 skiweber dhcdbd: dhco_parse_option_settings: bad option setting: new_dhcp_rebinding_time = 3650722200 
Nov 30 09:15:16 skiweber dhcdbd: message_handler: message handler not found under /com/redhat/dhcp/eth0 for sub-path eth0.dbus.get.host_name
Nov 30 09:15:16 skiweber dhcdbd: message_handler: message handler not found under /com/redhat/dhcp/eth0 for sub-path eth0.dbus.get.domain_name
Nov 30 09:15:16 skiweber dhcdbd: message_handler: message handler not found under /com/redhat/dhcp/eth0 for sub-path eth0.dbus.get.nis_domain
Nov 30 09:15:16 skiweber dhcdbd: message_handler: message handler not found under /com/redhat/dhcp/eth0 for sub-path eth0.dbus.get.nis_servers


This is a Lenovo ThinkPad T61 system with a default installation of the Ubuntu Gutsy Gibbon 7.10 amd64, etc.:

dweber@skiweber:~$ uname -a
Linux skiweber 2.6.22-14-generic #1 SMP Sun Oct 14 21:45:15 GMT 2007 x86_64 GNU/Linux

dweber@skiweber:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c)
00:01.0 PCI bridge: Intel Corporation Mobile PM965/GM965/GL960 PCI Express Root Port (rev 0c)
00:19.0 Ethernet controller: Intel Corporation 82566MM Gigabit Network Connection (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Contoller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 3 (rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 4 (rev 03)
00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3)
00:1f.0 ISA bridge: Intel Corporation 82801HBM (ICH8M-E) LPC Interface Controller (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 03)
01:00.0 VGA compatible controller: nVidia Corporation Quadro NVS 140M (rev a1)
03:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN Network Connection (rev 61)
15:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev ba)
15:00.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 04)
dweber@skiweber:~$