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USER’S GUIDE

Managed Rack PDU

155

DNS

Path: Administration > Network > DNS > options

Use the options under DNS to configure and test the Domain Name System (DNS):

• Select Primary DNS Server or Secondary DNS Server to specify the IPv4 or IPv6

addresses of the primary and optional secondary DNS server. For the Rack PDU to

send e-mail, you must at least define the IP

address of the primary DNS server.

– The Rack PDU waits up to 15 seconds for a response from the primary DNS server

or the secondary DNS server (if a secondary DNS server is specified). If the Rack

PDU does not receive a response within that time, e-mail cannot be sent.

Therefore, use DNS servers on the same segment as the Rack PDU 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.

• Host Name: After you configure a host name here and a domain name in the

Domain Name field, users can enter a host name in any field in the Rack PDU

interface (except e-mail addresses) that accepts a domain name.

• Domain Name (IPv4): You need to configure the domain name here only. In all other

fields in the Rack PDU interface (except e-mail addresses) that accept domain

names, the Rack PDU 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, somedomain.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 Rack PDU 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.

• Domain Name (IPv6): Specify the IPv6 domain name here.

• Select test to send a DNS query that tests the setup of your DNS servers:

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