HP ProCurve 1600M, Management And Configuration Manual

Page: 634 / 690

Troubleshooting
Diagnostic Tools
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:
C-50