Hello,We run Windows 2003 domain with two DHCP servers having two DHCP scopes. After reading RFC 2131 for DHCP, I have some questions regarding DHCP on Windows. Please find below my queries:1. Our setup for DHCP lease time is 30 days.I noticed in our setup, for example I started my computer and got an IP lease with address 10.10.1.10. I turned my computer off at evening. I start my computer the next day and I got a new IP address 10.10.1.19. I guess DHCP server should maintain 10.10.1.10 (my first lease IP) for 30 days. Am I right or is this the way DHCP works? When I look at DHCP MMC, my computer is associated with 10.10.1.19 (my new leased IP) and 10.10.1.10 is associated with another computer.I will appreciate if somebody could explain how this works?TIA

Clients must be sending release DHCP lease on shutdown which is probably the default.Regards, Dave Patrick .... Microsoft Certified Professional Microsoft MVP [Windows]

Hi ,By default, the lease time is 8 days , and once the dhcp client reaches 75% of its lease time , it sends a request to the dhcp server and performs the DORA process to get a new iPaddress.You can take a netmon capture to check if the dhcp server is sending NACK . And also recoincile scope to remove the inconsistencies.I would suggest you to follow the best practices of MS DHCP server.http://technet.microsoft.com/en-us/library/cc758710(WS.10).aspx