If you had your DHCP lease times set to 24hrs, lowering them will take a minimum of 12hrs (0.5 * least time) to take effect, and many DHCP clients are slightly broken and will take a full (lease time) to renew. Not to mention any of the really broken clients who don’t honour changes to the DHCP lease as long as they keep getting DHCPACKs – it sounds like this might be what you’re experiencing. The only solution is – usually – to reboot the device. If you have Win95/98 clients, you may have to use regedit to make it forget its old lease.
-Adam Thompson athom...@athompso.net From: Atkins, Dwane P [mailto:atki...@uthscsa.edu] Sent: Tuesday, March 15, 2011 10:34 To: 'support@pfsense.com' Subject: [pfSense Support] DHCP server settings We recently lowered our DHCP lease time to the default of 2 hours. After a couple hours, I was checking the DHCP leases and see some that have a difference of 2 hours from the Start and End time. However, there are some that have a 24 hour difference. Is there a way to completely clear out the DHCP lease time and restart the DHCP server. These leases started almost 3 hours after I had modified the default lease time. Thanks Dwane
