The lease time means life of an IP address remains assigned to a device. Once the ip address life ends, the address is released for the next request of an IP address.

The default lease time is 7 days.


To modify the lease time, use the following CLI commands:

Step-1 Switch to configuration mode

system config dhcp server

Step-2 show the list of available dhcp servers type


Step-3 chose the dhcp server you want to edit in my case server entry number is ‘1’ so i will type

edit 1

Step-4 set the lease time according to your requirements, i will set lease time ‘1’ hour  (1 hour = 3600 seconds).

set lease-time 3600

Save the configurations


That’s it, you have successfully reset the dhcp lease time on your Fortigate device.

If you like this Post, please give us your valuable feedback by pressing Vote Up / Vote Down Button. Thanks.


Similar Posts