Network configuration
DNS
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Note When using Active Directory for user authentication, set the DNS servers to be the Active
Directory servers or the devices that provide SRV records.
DNS servers
Dynamically assigned servers
Shows the DNS servers that are dynamically assigned to the controller when PPPoE or DHCP
is used to obtain an IP address on the Internet port.
Override dynamically assigned DNS servers
Enable this checkbox to use the DNS servers that you specify on this page to replace those
that are assigned to the controller.
Server 1
Specify the IP address of the primary DNS server for the controller to use.
Server 2
Specify the IP address of the secondary DNS server for the controller to use.
Server 3
Specify the IP address of the tertiary DNS server for the controller to use.
DNS advanced settings
DNS cache
Enable this checkbox to activate the DNS cache. Once a host name is successfully resolved to
an IP address by a remote DNS server, it is stored in the cache. This speeds up network
performance, because the remote DNS server does not have to be queried for subsequent
requests for this host.
An entry stays in the cache until one of the following is true:
An error occurs when connecting to the remote host.
The time to live (TTL) of the DNS request expires.
The controller restarts.
DNS switch on server failure
Controls how the controller switches between servers:
When enabled, the controller switches servers if the current server replies with a DNS
server failure message.
When disabled, the controller switches servers if the current server does not reply to a
DNS request.
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