Configuring Domain Name Server (Dns) Resolver - Dell PowerConnect B-RX Configuration Manual

7
Configuring IP parameters
ipv6 address fe80::3:4:2 link-local
ipv6 address 1011::1/64
ipv6 address 1001::1/64
ipv6 ospf area 0

Configuring Domain Name Server (DNS) resolver

The DNS resolver lets you use a host name to perform Telnet, ping, and traceroute commands. You
can also define a DNS domain on a device and thereby recognize all hosts within that domain. After
you define a domain name, the device automatically appends the appropriate domain to the host
and forwards it to the domain name server.
For example, if the domain "newyork.com" is defined on a device and you want to initiate a ping to
host "NYC01" on that domain, you need to reference only the host name in the command instead
of the host name and its domain name. For example, you could enter either of the following
commands to initiate the ping.
BigIron RX# ping nyc01
BigIron RX# ping nyc01.newyork.com
Defining a DNS entry
You can define up to four DNS servers for each DNS entry. The first entry serves as the primary
default address. If a query to the primary address fails to be resolved after three attempts, the next
gateway address is queried (also up to three times). This process continues for each defined
gateway address until the query is resolved. The order in which the default gateway addresses are
polled is the same as the order in which you enter them.
Suppose you want to define the domain name of newyork.com on a device and then define four
possible default DNS gateway addresses. To do so, enter the following commands.
BigIron RX(config)# ip dns domain-name newyork.com
BigIron RX(config)# ip dns server-address 209.157.22.199 205.96.7.15 208.95.7.25
201.98.7.15
Syntax: ip dns domain-name <name>
Syntax: ip dns server-address <ip-addr> [<ip-addr>] [<ip-addr>] [<ip-addr>]
The first IP address in the ip dns server-address... command becomes the primary gateway address
and all others are secondary addresses. Because IP address 201.98.7.15 is the last address
listed, it is also the last address consulted to resolve a query.
Defining a domain list
If you want to use more than one domain name to resolve host names, you can create a list of
domain names. For example, enter the commands such as the following.
BigIron RX(config)# ip dns domain-list company.com
BigIron RX(config)# ip dns domain-list ds.company.com
BigIron RX(config)# ip dns domain-list hw_company.com
BigIron RX(config)# ip dns domain-list qa_company.com
BigIron RX(config)#
The domain names are tried in the order you enter them.
Syntax: [no] ip dns domain-list <domain-name> sequence-number <sequence-number>
166 BigIron RX Series Configuration Guide
53-1001810-01