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Configure trunk interface with VLAN tagged.Configure the access port for the VLANs.Configure the switch for the VLAN traffic.How does inter-VLAN Communication happen on the fortigate firewall?.Similarly, any inbound traffic coming to the DMZ from the internet will be first hit on the outside WAN interface and then come to the DMZ. If the LAN network wanted to go out, the devices on the LAN segment would send the packet to the LAN gateway in the FortiGate firewall, and then it will send the packet out to the wan interface and to the internet. You have a Fortinet FortiGate firewall configured with LAN WAN and the DMZ networks as shown below. I know that defeats the whole purpose of having redundancy, but it is just an example, you may not want to configure both the ISP’s into single interface. Instead of using a separate port on the FortiGate firewall for the second ISP link, you can create a WAN2 network with VLAN 100 tagged to any of the physical ports on the FortiGate firewall and extend that tag to your network switch, that connect to the ISP link. FortiGate firewall is capable of running 802.1q tagging on its interfaces, so for example, you wanted to create a secondary ISP link for a dual ISP setup. We can configure VLAN on the FortiGate firewall to configure a separate network. There are times you might be running out of ports and want to configure another network on the FortiGate firewall, so how do you deal with that type of situation? Many of the FortiGate appliances come with enough ports for you to configure the network.
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