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  • Configure the DHCP server to send DDNS updates to DNS servers in the Grid. For information, see Sending Updates to DNS Servers in the Grid below.

  • Configure the DHCP server to send DDNS updates to external DNS servers. For information, see Configuring DDNS Features.

  • Configure certain DDNS features. For information, see Configuring DDNS Features.

  • Enable support for the FQDN option for IPv4 and IPv6 clients, and configure how the DHCP server updates DNS. For information, see Enabling FQDN Option Support.

Note

Note

Whether you deploy NIOS appliance in a Grid or independently, they send updates to UDP port 53. Grid members do not send updates through a VPN tunnel; however, Grid members do authenticate updates between each other using TSIG (transaction signatures) based on an internal TSIG key.

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  1. Grid: From the DataManagement tab, select the DHCP tab, expand the Toolbar and click GridDHCPProperties. 
    Member: From the DataManagement tab, select the DHCP tab and click the Members tab -> Members -> member checkbox -> Edit icon.
    Network: From the DataManagement tab, select the DHCP tab and click the Networks tab -> Networks -> network checkbox -> Edit icon.
    NetworkContainer: From the DataManagement tab, select the IPAM tab -> network_container checkbox, and then click the Edit icon. 
    NetworkTemplate: From the DataManagement tab, select the DHCP tab and click the Templates tab -> DHCP_template checkbox -> Edit icon.
    RoamingHost: From the DataManagement tab, select the DHCP tab and click the Networks tab -> RoamingHosts -> roaming_host -> Edit icon.
    For IPv4 clients only:IPv4AddressRange: From the DataManagement tab, select the DHCP tab and click the Networks tab -> Networks -> network -> addr_range checkbox -> Edit icon. 
    IPv4FixedAddress: From the DataManagement tab, select the DHCP tab and click the Networks tab -> Networks -> network -> ip_addr checkbox -> Edit icon.
    IPv4AddressRange/FixedAddressTemplate: From the DataManagement tab, select the DHCP tab and click the Templates tab -> DHCP_template checkbox -> Edit icon.
    To override an inherited property, click Override next to it and complete the appropriate fields.

  2. In the IPv4DDNS -> Basic tab or the IPv6DDNS -> Basic tab, complete the following:

    • Enable DDNS Updates: Select this checkbox to enable DDNS updates.

      When setting properties for DHCP objects other than the Grid, you must click Override and select Enable DDNS updates for the DDNS settings to take effect. When turning on DDNS updates, first verify if Option 81 has been enabled and whether DNS is being updated. If DNS is being updated, even if the DNS zone targets are not in the Grid,  select Option 81 support and the correct sub option. For more information, see Enabling FQDN Option Support.

      When the Enable DDNS Updates checkbox is not selected, the default behaviour is to allow the client to update DNS.

      When the Enable DDNS Updates checkbox is selected, the default behaviour is to prevent DDNS updates from the client.
      In a dual mode Grid, if IPv6 DDNS updates is enabled at the Grid level, then when you join an IPv6 Grid member to the Grid, IPv6 DDNS updates is automatically disabled for the Grid member.

    • DDNS domain name: Specify the domain name of the network that the appliance uses to update DNS. For IPv4 clients, you can specify this at the network, network template, range, and range template levels. For IPv6 clients, you can specify this at the Grid, member, network, shared network, and network template levels.

    • DDNS Update TTL: You can set the TTL used for A or AAAA and PTR records updated by the DHCP server. The default is shown as zero. If you do not enter a value here, the appliance by default sets the TTL to half of the DHCP lease time with a maximum of 3600 seconds. For example, a lease time of 1800 seconds results in a TTL of 900 seconds, and a lease time of 86400 seconds results in a TTL of 3600 seconds. For information about how to set the lease time, see Defining Lease Times.

    • DDNS Update Method: Select the method used by the DHCP server to send DDNS updates. You can select either Interim or Standard from the drop-down list. The default is Interim. When you select Interim, TXT record will be created for DDNS updates and when you select Standard, DHCID record will be created for DDNS updates. But in the IPv4 DDNS -> Advanced tab or the IPv6 DDNS -> Advanced tab, if you have selected No TXT Record mode for the DHCP server to use when handling DNS updates, then TXT record or DHCID record is not created for DDNS updates.
      If you change the DDNS update method from Interim to Standard or vice versa, then the DHCP server changes the DHCID type used from TXT record to DHCID record or vice versa as the leases are renewed.
      This is supported for clients that acquire both IPv4 and IPv6 leases. Infoblox recommends you to configure different DDNS update method for IPV4 leases and IPv6 leases, Interim for IPv4 lease and Standard for IPv6 lease.

    • Update DNS on DHCP Lease Renewal: Select this checkbox to enable the appliance to update DNS when a DHCP lease is renewed.

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

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