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C:\>nslookup www.microsoft.com 207.46.138.20
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You can also use Nslookup to resolve IP addresses to host names. For example, the fol lowing command executed at the command prompt returns the FQDN associated with the address 207.46.230.220, as shown in this output:
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C:\>nslookup 207.46.249.222 Server: localhost Address: 127.0.0.1 Name: www.microsoft.com Address: 207.46.249.222
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Reverse lookups rely on pointer (PTR) resource records configured in reverse lookup domains. Reverse lookup domains are not available for all Internet hosts.
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If you need to resolve more than a single host name or IP address, or if you want to troubleshoot DNS by performing various functions, you can use Nslookup as an interactive program. To enter interactive mode, simply type nslookup at the command prompt and press Enter.
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In interactive mode, Nslookup accepts commands that allow the program to perform a variety of functions, such as displaying the specific contents of messages included in DNS exchanges, simulating a zone transfer, or searching for any or all records of a spe cific type at a given server. These commands can be displayed by entering the Help or command, as shown in Figure 6-1.
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Figure 6-1
Nslookup commands
Exploring Nslookup Options
When in interactive mode, you can also use the Set command to configure Nslookup options that determine how the resolver carries out queries. For example, Nslookup can be set to Debug or Nodebug. By default, the Nodebug option is enabled, but when you enable the Debug option by using the Set Debug command, Nslookup enters Debug mode. In Debug mode, Nslookup displays the DNS response messages commu nicated from the DNS server.
Commands entered in Nslookup interactive mode are case-sensitive and must be typed in lowercase.
Important
You can view the options currently configured for Nslookup by running the Set All command, as shown in Figure 6-2.
6
Monitoring and Troubleshooting DNS
Figure 6-2 Displaying Nslookup options
Table 6-1 describes the most common options configured with the Set command.
Table 6-1
Command-Line Options Available with Set
Purpose Shows the configuration status of all options. Puts Nslookup in Debug mode. With Debug mode turned on, more information is printed about the packet sent to the server and the resulting answer. Puts Nslookup in Verbose Debug mode so you can exam ine the query and response packets between the resolver and the server. Tells the resolver which domain name to append for unqualified queries, including all queried names not fol lowed by a trailing dot. Tells the resolver which time-out value to use, in seconds. This option is useful for slow links where queries fre quently time out and the wait time must be lengthened. Tells the resolver which type of resource records to search for (for example, A, PTR, or SRV). If you want the resolver to query for all types of resource records, type set type=all.
Option set all set [no]debug
set [no]d2
set domain=<domain name>
set timeout=<time-out value>
set type=<record type> or set querytype=<record type> or set q=<record type>
The next section describes how to perform common tasks by using Nslookup in interactive mode.
Lesson 1
Using DNS Troubleshooting Tools
Looking Up Different Data Types
By default, names queried for in Nslookup return only matching host address (A) resource records. To look up different data types within the domain namespace, use the Set Type or Set Querytype (Set Q) command at the command prompt. For exam ple, to query for mail exchanger (MX) resource records only instead of A resource records, type set q=mx, as shown here:
C:\>nslookup
Default Server: localhost
Address: 127.0.0.1
set q=mx
> microsoft.com
Server: localhost
Address: 127.0.0.1
Non-authoritative answer:
microsoft.com MX preference = 10, mail exchanger = mailc.microsoft.com
microsoft.com MX preference = 10, mail exchanger = maila.microsoft.com
microsoft.com MX preference = 10, mail exchanger = mailb.microsoft.com
microsoft.com nameserver = dns1.cp.msft.net
microsoft.com nameserver = dns1.tk.msft.net
microsoft.com nameserver = dns3.uk.msft.net
microsoft.com nameserver = dns1.dc.msft.net
microsoft.com nameserver = dns1.sj.msft.net
mailc.microsoft.com internet address = 131.107.3.121
mailc.microsoft.com internet address = 131.107.3.126
maila.microsoft.com internet address = 131.107.3.124
maila.microsoft.com internet address = 131.107.3.125
mailb.microsoft.com internet address = 131.107.3.122
mailb.microsoft.com internet address = 131.107.3.123
dns1.cp.msft.net internet address = 207.46.138.20
dns1.tk.msft.net internet address = 207.46.245.230
dns3.uk.msft.net internet address = 213.199.144.151
dns1.dc.msft.net internet address = 64.4.25.30
dns1.sj.msft.net internet address = 65.54.248.222>
To query for a record of any type, execute the Nslookup command Set q=any.
The first time a query is made for a remote name, the answer is authoritative, but subsequent queries are nonauthoritative. This pattern appears for the following reason: The first time a remote host is queried, the local DNS server contacts the DNS server that is authoritative for that domain. The local DNS server then caches that information so that subsequent queries are answered nonauthoritatively out of the local server s cache.
6
Monitoring and Troubleshooting DNS
Querying Another Name Server Directly
To query another name server directly, use the Server or Lserver commands to switch to that name server. The Lserver command uses the local server to get the address of the server to switch to, whereas the Server command uses the current default server to get the address. After you execute either of these commands, all subsequent lookups in the current Nslookup session are performed at the specified server until you switch servers again. The following lines illustrate such a server switch:
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