VLAN Probe
VLAN probe feature enables FortiAPs to probe connected VLANs and subnets. It sends DHCP probes from the FortiAP’s Ethernet interface to specific VLANs on the wired interface and returns information on their availability and subnet details. This helps diagnose and troubleshoot WiFi deployment issues.
Navigate to Monitor > Overview > AP and click the VLAN Probe icon in the AP details tile.