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To set up one or more NIOS appliances for DDNS updates originating from DHCP, you must configure at least one DHCP server and one DNS server. These servers might be on the same appliance or on separate appliances. Three possible arrangements for a DHCP server to update a DNS server are shown in Figure 21.1.
Figure 21.1 Relationship of DHCP and DNS Servers for DDNS Updates | Drawio |
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Here is a closer look at one setup for performing DDNS updates from a DHCP server (the steps relate to Figure 21.2).
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Figure 21.2 DDNS Update from a DHCP Server | Drawio |
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To enable a DHCP server to send DDNS updates to a DNS server, you must configure both servers to support the updates. First, configure the DHCP server to do the following:
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When setting up DDNS, you can determine the amount of information that DHCP clients provide to a DHCP server — and vice versa — and where the DDNS updates originate. A summary of these options for IPv4 is shown in Figure 21.3. It is similar for IPv6, except that the DHCP client and server exchange Request and Reply messages, AAAA records are updated instead of A records, and the FQDN option is option 39.
Figure 21.3 DHCP Clients and Server Providing DNS Information and Updates | Drawio |
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You can configure the DHCP and DNS settings for DDNS at the Grid level, member level, and network and zone level. By applying the inheritance model in the NIOS appliance, settings made at the Grid level apply to all members in the Grid. Settings you make at the member level apply to all networks and zones configured on that member. Settings made at the network and zone level apply specifically to just that network and zone. When configuring independent appliances (that is, appliances that are not in a Grid), do not use the member-level settings. Instead, configure DDNS updates at the Grid level to apply to all zones and, if necessary, override the Grid-level settings on a per zone basis.
