Dns Resolver; Terminology; Basic Operation - HP ProCurve Management And Configuration Manual

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C-50

DNS Resolver

The Domain Name System (DNS) resolver is designed for use in local network
domains where it enables use of a host name or fully qualified domain name
to perform ping and traceroute operations from the switch.

Terminology

Domain Suffix — Includes all labels to the right of the unique host name in
a fully qualified domain name assigned to an IP address. For example, in
the fully qualified domain name "device53.evergreen.trees.org", the
domain suffix is "evergreen.trees.org", while "device53" is the unique
(host) name assigned to a specific IP address.
Fully Qualified Domain Name — The sequence of labels in a domain name
identifying a specific host (host name) and the domain in which it exists.
For example, if a device with an IP address of 10.10.10.101 has a host name
of device53 and resides in the evergreen.trees.org domain, then the
device's fully qualified domain name is device53.evergreen.trees.org and
the DNS resolution of this name is 10.10.10.101.
Host Name — The unique, leftmost label in a domain name assigned to a
specific IP address in a DNS server configuration. This enables the server
to distinguish a device using that IP address from other devices in the
same domain. For example, in the evergreen.trees.org domain, if an IP
address of 10.10.100.27 is assigned a host name of accounts015 and
another IP address of 10.10.100.33 is assigned a host name of sales021,
then the switch configured with the domain suffix evergreen.trees.org and
a DNS server that resolves addresses in that domain can use the host
names to reach the devices with ping and traceroute commands:
ping accounts015
traceroute sales021

Basic Operation

When the switch is configured with only the IP address of a DNS
■
server available to the switch, then a ping or traceroute command,
executed with a fully qualified domain name, can reach a device found
in any domain accessible through the configured DNS server.
When the switch is configured with both of the following:
■
• the IP address of a DNS server available to the switch
• the domain suffix of a domain available to the configured DNS
server
then: