FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Mohammed_Feroz
Article Id 249778
Description This article describes how to add a unique DHCP lease time to a Specific IP range under the same DHCP server.
Scope 7.2.4 onwards.
Solution

There might be a requirement where a specific set of IP ranges needs a higher DHCP lease and others need a lower DHCP lease time under the same DHCP server.

 

In the below example:

 

DHCPserver.jpg

DHCP server has a global lease time of 7 days (604800 seconds).

 

1) First IP range will use the global DHCP lease time.
2) Second IP range will use 1 hour (3600 secs) as its DHCP lease time (only available over CLI).

 

# config system dhcp server

    edit 2
        set dns-service default
        set default-gateway 172.31.205.234
        set netmask 255.255.240.0
        set interface "port3"
            # config ip-range
                 edit 1
                     set start-ip 172.31.192.2
                     set end-ip 172.31.207.10
                 next
                 edit 2
                     set start-ip 172.31.207.11
                     set end-ip 172.31.207.20
                     set lease-time 3600
                 next
             end
    next
end