Build a High-Security Lab | Fortigate Inter-VLAN Routing in GNS3

Inter-VLAN routing is the process that enables communication between different VLANs (Virtual Local Area Networks) using a Layer 3 device such as a router, Layer 3 switch, or a firewall like a FortiGate. Since VLANs are designed to separate networks and reduce broadcast traffic, devices in one VLAN cannot communicate directly with devices in another VLAN. In this lab, you demonstrate how to set up multiple VLANs (Sales and Finance) on a single physical port of a FortiGate firewall, including DHCP configuration. 00:00 - Lab Introduction and Network Diagram 01:40 - Initial Firewall Access and Basic Setup 02:10 - Identifying the Management IP Address 03:15 - Navigating to Network Interfaces in Web GUI 03:40 - Creating VLAN 10 (Sales Department) 04:30 - Creating VLAN 20 (Finance Department) 05:15 - Enabling DHCP Server for the VLANs 05:35 - Testing Configuration: IP Acquisition via DHCP 06:00 - Verifying Connectivity: Pinging the Gateway 06:20 - Summary and Closing