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 

get

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 

 end

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

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