To configure a Palo Alto Networks firewall as a DHCP server:
Begin by opening a new WebUI management session
Navigate to Network > DHCP > DHCP Server
Click the Add button at the bottom of the window.
The DHCP Server configuration window will open and the DHCP server options will be displayed. Note: The sections shaded in yellow are the minimum fields necessary for a working DHCP deployment, however additional options may be configured as needed.
Select the interface which will be sourcing DHCP leases
Specify the default gateway and primary DNS
Specify the desired lease range in the 'IP Pools' section.
Address ranges may be entered using CIDR notation, or by entering the start and end IP addresses in the range separated by a "-" dash.