The entries on the DNS server would look like the following after the registration. To view the DNS entries on your local DNS server, click on Start -> Administrative Tools -> DNS. This will open the DNS Manager GUI.
In this example, the network name testcno will be registered against 2 IPv4 addresses 172.24.13.99 and 22.214.171.124 which are on different subnets. The ‘Or’ is a dependency which the NetName has on the IP Addresses which implies that EITHER the 172.24.13.99 IPv4 Address OR the 126.96.36.199 IPv4 Address must come online before the Network Name resources comes online.
In Windows Server 2008 R2 we have improved how the DNS registration logic is implemented within the cluster resource DLL implementation of network name resource.
· During network name resource online or immediately after the online:
o The network name resource in an OR dependency is onlined if one or more of its providers is online. Typically an IPv6 address resource comes online quicker than an IPv4 address resource. So during online of a network name resource, the DNS registration for the IPv6 provider happens.
o The registration for the IPv4 provider typically happens immediately after the online.
· If the cluster is idle, the registration is refreshed every 24 hours:
o If the network name group is not moved or there are no new dependencies or there are no changes to the name, then the registration is refreshed only once in 24 hours.
· If an IP address provider dependency is added or removed:
o When a new provider is added or removed for the network name resource, the DNS registration update happens automatically without requiring an offline & online of the resource itself.
In Windows Server 2008, DNS registration behaved slightly differently. If the Network Name had been registered within the last 24 hours, then it would reregister with DNS 10 minutes after coming online. If it had not been registered within the past day, then it is immediately registered when the resource comes Online.
1. A network adapter can have a DNS suffix that is different from the primary DNS suffix of the host.
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