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PowerConnect B-Series FCX Configuration Guide 805
53-1002266-01
Configuring IP parameters – Layer 3 Switches
26
Defining DNS server addresses
You can configure the Dell PowerConnect device to recognize up to four DNS servers. 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 DNS address is queried (also up to three times). This process continues for
each defined DNS address until the query is resolved. The order in which the default DNS
addresses are polled is the same as the order in which you enter them.
To define DNS servers, enter a command such as the following.
PowerConnect(config)# ip dns server-address 209.157.22.199 205.96.7.15
208.95.7.25 201.98.7.15
Syntax: [no] ip dns server-address <ip-addr> [<ip-addr>] [<ip-addr>] [<ip-addr>]
In this example, the first IP address entered becomes the primary DNS 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.
PowerConnect(config)# ip dns domain-list company.com
PowerConnect(config)# ip dns domain-list ds.company.com
PowerConnect(config)# ip dns domain-list hw_company.com
PowerConnect(config)# ip dns domain-list qa_company.com
PowerConnect(config)#
The domain names are tried in the order you enter them
Syntax: [no] ip dns domain-list <domain-name>
Using a DNS name to initiate a trace route
Suppose you want to trace the route from a Layer 3 Switch to a remote server identified as NYC02
on domain newyork.com. Because the NYC02@ds1.newyork.com domain is already defined on the
Layer 3 Switch, you need to enter only the host name, NYC02, as noted in the following example.
PowerConnect# traceroute nyc02
Syntax: traceroute <host-ip-addr> [maxttl <value>] [minttl <value>] [numeric] [timeout <value>]
[source-ip <ip addr>]
The only required parameter is the IP address of the host at the other end of the route.
After you enter the command, a message indicating that the DNS query is in process and the
current gateway address (IP address of the domain name server) being queried appear on the
screen.
Type Control-c to abort
Sending DNS Query to 209.157.22.199
Tracing Route to IP node 209.157.22.80
To ABORT Trace Route, Please use stop-traceroute command.
Traced route to target IP node 209.157.22.80:
IP Address Round Trip Time1 Round Trip Time2
207.95.6.30 93 msec 121 msec