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.
JohnDevNet_FTNT
Article Id 198766
Description
This article provides a solution to enable the reservation of IP addresses from the excluded DHCP range.

This may be useful when there is a requirement to reserve some IP addresses from the DHCP pool to avoid them being reassigned.  If an excluded range has been configured then this can be achieved by using the following solution.

Solution
Reserve IP from the DHCP Pool with bogus MAC Address and change them with the real MAC Address when they need to be used.
    config system dhcp server
    edit 1
    config ip-range
                    edit 1
                                       set start-ip 192.168.1.1
    set end-ip 192.168.1.100
                                next
                     end

                 config system dhcp server
        edit 1
     config reserved-address
                    edit 1
                        set ip 192.168.1.1
                        set mac 00:00:00:00:00:01
                    next
                            edit 2
                        set ip 192.168.1.2
                        set mac 00:00:00:00:00:02
                    next
                            edit 3
                        set ip 192.168.1.3
                        set mac 00:00:00:00:00:03
                    next
                            edit 4
                        set ip 192.168.1.4
                        set mac 00:00:00:00:00:04
                    next
                            edit 5
                        set ip 192.168.1.5
                        set mac 00:00:00:00:00:05
                    next
                            edit 6
                        set ip 192.168.1.6
                        set mac 00:00:00:00:00:06
                    next
                            edit 7
                        set ip 192.168.1.7
                        set mac 00:00:00:00:00:07
                    next
                            edit 8
                        set ip 192.168.1.8
                        set mac 00:00:00:00:00:08
                    next
                            edit 9
                        set ip 192.168.1.9
                        set mac 00:00:00:00:00:09
                    next
                            edit 10
                        set ip 192.168.1.10
                        set mac 00:00:00:00:00:10
                    next
                end

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