When a Win2K or later client that already has a DHCP lease tries to boot, it attempts to renew its lease with its previous DHCP server by sending a DHCPRequest packet. If the DHCP server responds with a DHCPAck packet, the client renews its lease. If the DHCP server responds with a DHCPNack, the client restarts the lease process. If the DHCP server doesn't respond, the client pings the default gateway defined in the current lease. If the Ping succeeds, the client continues to use its current lease, attempting to renew at 50 percent of its assigned lease time. If the Ping fails, the client autoconfigures the IP address and continues to attempt to find a DHCP server in the background
Learn how to configure clients to release leases on shutdown at WindowsItPro.comDo Windows 2000 or later DHCP clients renew their existing lease on restart?
