Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

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If you have a new FortiGate Firewall, You should read this article. How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall.

How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

We practice with a small example like above. You said a static IP address for your PC as above. The article guides pppoe dialing configuration for WAN ports on Fortigate devices. 

Connect the FortiGate's interface port 2 to your ISP-supplied equipment and Connect a PC to the FortiGate using an internal port (port1).

Enable PPPoE

Configure PPPoE dial-up connection on 1 interface with CLI. If this step is not configured, there are only 2 modes on the interface: Static and DHCP.

How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

PPPoE Client configuration

Configure PPPoE dialing using the web interface. Go to Network -> Select Interface -> Select the interface you want as an WAN port to dial the PPPoE -> Click Edit.

  • Role: Choose "WAN"

  • Addressing mode: Choose "PPPoE"

  • Enter username and password provided by your carrier

Click "OK" to save you settings.

How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

Configure the internal interface

Select the interface you want as an LAN port.

How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

In this case, DHCP is enabled. Click "OK" button to save your settings.

How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

Configure default route static routes

  • Set the Interface to WAN

  • Set the gateway address to Dynamic

How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

Firewall Policy & NAT

Creating a policy to allow traffic from the internal Network to the internet.

Go to Policy and Objects Firewall Policy and create a New policy.

  • Set the incoming interface to the Lan interface in the outgoing interface to the internet facing interface.

  • Set Source, Destination Address, Schedule, and Services is all.

  • Make sure the Action is set to ACCEPT.

  • Turn on NAT and make sure Use Outgoing Interface Address is selected

How to Configuration PPPoE DHCP NAT LAN IP Internet On Fortigate Firewall

You can now browse the Internet using any computer that connects to the FortiGate's internal interface. I hope this article helped you connect and configure a new FortiGate so that computers can connect to the internet.

Tags: DHCP FortiGate