Technical Tip: Configure DHCP option 12

xshkurti · ‎05-30-2023

Description

This article describes how to configure DHCP Option 12 on FortiGate DHCP Server Settings.

Scope

All FortiOS.

Solution

From GUI:
First enable the DHCP server under the interface:

The second step is to expand the Advanced tab and select the 'Create New' Option:

To configure option 12, create new option with the following parameters:

Option code: 12(Host Name)

Value type: String

Value: hostname <----- In this case hostname 'test' has been used.

After this, option 12 will be provided to users:

From CLI:

config system dhcp server

edit 1
set domain "lab.local"
set default-gateway 192.168.199.1
set netmask 255.255.255.0
set interface "port8" <----- In the case it is necessary to select FortiGate port where clients will send DHCP requests.
config ip-range
edit 1
set start-ip 192.168.199.10
set end-ip 192.168.199.254
next
end
config options
edit 1
set code 12
set type string
set value "test"
next
end
set dns-server1 8.8.8.8
next
end

Related article:
Technical Tip: How to configure FortiGate as DHCP ... - Fortinet Community