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• Enable support for the option and specify who performs the DDNS update. For more information, see Enabling FQDN Option Support velow.

• Specify the DNS zones and DNS view for the updates. For more information, see Sending Updates for DHCP Clients Using the FQDN Option below.

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Enabling FQDN Option Support

You can configure support for the FQDN option for IPv4 and IPv6 clients at the Grid, member, network and shared network levels.
To configure support for the FQDN Option (option 81) for IPv4 and (Option 39) for IPv6:

1. Grid: From the Data Management tab, select the DHCP tab, expand the Toolbar and click Grid DHCP Properties.
   Member: From the Data Management tab, select the DHCP tab and click the Members tab -> member checkbox -> Edit icon.
   Network: From the Data Management tab, select the DHCP tab and click the Networks tab -> Networks -> network checkbox -> Edit icon.
   Shared Network: From the Data Management tab, select the DHCP tab and click the Networks tab -> Shared Networks -> shared_network checkbox -> Edit icon.
   To override an inherited property, click Override next to it and complete the appropriate fields.

2. In the IPv4 DDNS -> Advanced tab for the Grid and member, or the IPv4 DDNS -> Basic tab for the network, do the following:

   • Option 81 Support

     • Enable Option 81 Support: Select this to enable the support for option 81.

     • DHCP server always updates DNS: Select this to allow the DHCP server to update DNS, regardless of the requests from DHCP clients.

     • DHCP server updates DNS if requested by client: Select this to allow the DHCP server to update DNS only when requested by DHCP clients.

3. In the IPv6 DDNS -> Advanced tab for the Grid and member, or the IPv6 DDNS -> Basic tab for the network, do the following:

   • FQDN Support: Select Enable FQDN Support and select one of the following to indicate whether the DHCP server or the client performs the DDNS update.

     • DHCP always updates DNS

     • DHCP updates DNS if requested by client

4. Save the configuration and click Restart if it appears at the top of the screen.

When a lease expires, the DHCP server removes the A or AAAA records and PTR records that it updated. It does not remove any records that the client updated.

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You must specify the DNS view to be updated for each network view.
To send updates to zones for DHCP IPv4 and IPv6 clients using the FQDN option:

1. If there are multiple network views in the Grid, select a network view.

2. From the Data Management tab, select the DHCP tab, and then click Configure DDNS from the Toolbar.

3. In the DDNS Properties editor, complete the following:

   • DNS View: If a network view has more than one DNS view, this field lists the associated DNS views. From the drop-down list, select the DNS view to which the DHCP server sends DDNS updates. Otherwise, the appliance uses the default DNS view.

   • Zones to Update for Hosts Using DHCP FQDN Option: In this section, you can define forward-mapping zones to which the DHCP server sends DDNS updates for IPv4 and IPv6 DHCP clients that use the FQDN option. You must first enable support for the FQDN option before the DHCP server can send DDNS updates to these zones. By default, the DHCP server sends DDNS updates to zones using the domain name that you define for DHCP objects, such as networks and DHCP ranges. For clients using this option, the DHCP server uses the domain name defined in the option.
     Click the Add icon to specify a forward-mapping zone. Note that the Forward-mapping Zone Selector dialog box displays only the DNS zones that are associated with the selected DNS view. The zones you select here are written to the dhcpd.conf file and the dhcpdv6.conf file as "zone" statements with the matching TSIG key of the DNS view, so the updates are sent to the correct DNS view.

4. Save the configuration and click Restart if it appears at the top of the screen.