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When you create devices or group device you can apply it on policy or captive portal. 2 ways to add device on fortigate firewall as detail below; 1. Scan device on your network by using "network device scan" feature on fortigate firewall interface after on feature you ill have device list on your network and you can add new device item now 2. Add MAC address into device item.

DHCP server can distribute static IP address to client by using MAC address device but static IP should not duplicate with IP pool on DHCP server. This feature may help you for easy to manage IP address in your organization. Step as Video 

When you enable feature captive portal that force client must authenticate before access to the internet but you want to exempt some client such as VIP, Admin, Board, President. You can exempt captive portal for them by add MAC address device to captive portal configuration Step as Video