APC DNS (Adminstration>Network>DNS>servers)

41InRow RC/RD/RP (600 mm) User’s Guide
DNS (Adminstration>Network>DNS>servers)
Use the options under DNS on the left navigation menu to configure and test the Domain Name System
(DNS):
• Select ser vers to specify the IP addresses of the primary and optional secondary Domain Name
System server. The cooling unit cannot send any e-mail messages unless at least the IP address of
the primary DNS server is defined.
– The cooling unit waits a maximum of 15 seconds for a response from the primary DNS server
or the secondary DNS server (if a secondary DNS server is specified). If the cooling unit does
not receive a response within that time, e-mail cannot be sent. Therefore, use DNS servers on
the same segment as the cooling unit or on a nearby segment (but not across a wide-area
network [WAN]).
– After you define the IP addresses of the DNS servers, verify that DNS is working correctly by
entering the DNS name of a computer on your network to look up the IP address for that
computer.
• Select naming to define the host name and domain name of the cooling unit:
–Host Name: When an Administrator configures a host name here and a domain name in the
Domain Name field, users can then enter a host name in any field in the cooling unit interface
(except e-mail addresses) that accepts a domain name as input.
–Domain Name: An Administrator must configure the domain name here only. In all other
fields in the cooling unit interface (except e-mail addresses) that accept domain names, the
cooling unit adds this domain name when only a host name is entered.
• To override all instances of the expansion of a specified host name by the addition of the
domain name, set the domain name field to its default, example.com, or to 0.0.0.0.
• To override the expansion of a specific host name entry—for example when defining a
trap receiver—include a trailing period. The cooling unit recognizes a host name with a
trailing period (such as mySnmpServer.) as if it were a fully qualified domain name
and does not append the domain name.
• Select test to send a DNS query that tests the setup of your DNS servers:
–As Query Type, select the method to use for the DNS query:
•by Host: the URL name of the server
•by FQDN: the fully qualified domain name
•by IP: the IP address of the server
•by MX: the Mail Exchange used by the server
–In the Query Question field, identify the value to be used for the selected query type:
– View the result of the test DNS request in the Last Query Response field.
Query Type Selected Query Question to Use
by Host the URL
by FQDN the fully qualified domain name, formatted as
my_server.my_domain.com.
by IP the IP address
by MX the Mail Exchange address