Fortigate Firewall DHCP Commands

Posted by keith.wirch at November 6, 2016

Category: Fortigate, Networking, Quick Notes

Here is some quick notes about working with DHCP in a Fortigate firewall.  It is pretty common to have to work with them when you have a small office firewall.  I would not recommend using the DHCP Sever service on these firewalls in a large production environment.  Microsoft makes a pretty good one as a role in their server.

Showing/Clearing a DHCP Lease List

exec dhcp lease-list  #show current list on DHCP lease
execute dhcp lease-clear <ip address> #clear the DHCP lease of a specific ip
execute dhcp lease-clear all  #clear all the DHCP leases

Setting DHCP reservation on FortiOS 5.x

config system dhcp server  #Brings you into config mode of DHCP
edit 1 #This number will depend on what scope you are add the res too.  Use "show" to display them all.
config reserved-address
edit 1  #Increment this number for each reservation you need
set ip <ip address>
set mac <MAC Formatted 99:99:99:33:33:33>

Setting DHCP reservation on Pre-FortiOS5.x

config system dhcp reserved-address
edit "My_Reservation"
set ip <ip address>
set mac <MAC Formatted 99:99:99:33:33:33>
next
end

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