# Configure DHCP Option 81

*Applies to: Pearl-2, Pearl Mini, Pearl Nexus, Pearl Nano*

Ensure your Domain Name Server (DNS) always has your Pearl device's most up-to-date IP address mapped to its Fully Qualified Domain Name (FQDN). Option 81 support means you can keep using Pearl's FQDN no matter how many times the DHCP server may change Pearl's IP address. The device automatically asks the DHCP server to tell the Domain Name Server (DNS) to update its record with any changes to its IP address or FQDN. DHCP Option 81 is disabled by default.

**Important considerations**

- The DHCP server must support Option 81 for this feature to work.

- DHCP should be enabled and setup before enabling DHCP Option 81.

- You need the FQDN of your Pearl system for this procedure. Consult your network administrator if you don't have that information.

**Configure DHCP Option 81 using the Admin panel**

- Log in to the Admin panel as admin.

- From the Configuration menu, select Network. The Network configuration page opens.

- Under Settings, check Send FQDN (DHCP Option 81).

- In the DNS FQDN field, enter the FQDN of your Pearl device, for example: mypearl.mydomain.com

- Click Apply.

- Reboot the device when prompted.

- After the system has finished rebooting, log back in to the Admin panel as admin and verify that all changes were applied.

> product: pearl-family · topic: other · source: pearl-family-common.md · updated: Oct 13, 2026