Step 1 - Login into fortigate firewall console.
Step 2 - Check the firewall details.
Step 3 - Configure the WAN for internet access. The static IP will get from ISP provider.
Step 4 - Configure the LAN for internal network access and also need to enable DHCP server on this interface.
Note: Client side, we can configure Static IP or DHCP. If we are using DHCP, IP will release from Fortigate DHCP server.
Step 5 - Now we need to enable static route for internet access.
Step 6 - Configure the DNS for name resolving.
Step 7 - Configuring policy route for forcefully routing. Here, I am using Internet-over-VPN connection (PPPoE), in this case it may not work properly, so I create policy route.
Note: First preference will be policy route. If any policy created in the policy route, this will be given the priority.
Step 8 - Create a policy for accessing Internal LAN to VPN and VPN to Internal LAN connection. And also we need to create Internal LAN to WAN for internet accessing.