APC ACRP500 User Manual

Use the options under DNS on the left navigation menu to configure and test the Domain Name System 
(DNS):

•  Select servers 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 

 

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.

by Host

the URL

by FQDN

the fully qualified domain name, formatted as 
my_server

.

.com

.

by IP

the IP address

by MX

the Mail Exchange address