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Tools for Troubleshooting
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FIgURE 31-1 Use Network Monitor to capture and analyze traffic .
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For additional information about Network Monitor and to keep up with the
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latest improvements, read the Network Monitor Team blog at http://blogs.technet.com /netmon/.
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Nslookup
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Nslookup (Nslookup .exe) is the primary tool for isolating DNS name resolution problems when connected to the client experiencing the problems . Nslookup is a command-line tool capable of performing DNS lookups and reporting on the results . Other tools, such as PathPing, are capable of resolving host names to IP addresses and displaying the results, but only Nslookup displays the DNS server used to resolve the request . Additionally, Nslookup displays all the results returned by the DNS server and allows you to choose a specific DNS server rather than using the server automatically chosen by Windows . Nslookup is the correct tool to use when troubleshooting the following types of problems:
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Clients take several seconds to establish an initial connection . Some clients can establish a connection to a server, but other clients experience problems . The DNS server is configured correctly, but clients are resolving host names incorrectly .
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note
The Hosts file, located in the %WinDir%\System32\Drivers\Etc folder, might
contain static entries that override DNS lookups for most applications. Nslookup ignores this file, however. If applications resolve a host name differently than Nslookup, verify that the Hosts file does not contain an entry for the host name.
Verifying that the Default DNS Server Resolves Correctly
To verify that a client is able to resolve a host name to the correct IP address, open a command prompt and type the command nslookup hostname. Nslookup reports the server used to resolve the request and the response from the DNS server . If the client has been configured to use multiple DNS servers, this action might reveal that the client is not issuing requests to the primary DNS server . To resolve a DNS host name to an IP address, open a command prompt and run the following command .
nslookup hostname
To resolve an IP address to a DNS host name by performing a reverse DNS lookup, open a command prompt and run the following command .
nslookup ipaddress
If the DNS server returns multiple IP addresses, Nslookup displays all addresses . Generally, applications use the first IP address returned by the DNS server . Some applications, including Internet Explorer, try each IP address returned by the DNS server until a response is received .
Verifying that a Specific DNS Server Resolves Correctly
One of the most common sources of DNS resolution problems is the caching of an outdated DNS address . Particularly on the Internet, DNS servers might continue to return an outdated IP address several hours after a change has been made to the DNS server containing the record . If some clients are unable to correctly resolve an IP address but other systems resolve it correctly, one or more DNS servers have probably cached the incorrect address . To identify the problematic DNS servers, use Nslookup to manually query each server . To verify that a specific DNS server is able to resolve a host name to the correct IP address, open a command prompt and run the following command .
nslookup hostname server_name_or_address
Nslookup will query the specified server only, regardless of the DNS servers configured on the client . If a specific server returns an incorrect IP address, that server is the source of the problem . Generally, this problem will resolve itself after the incorrect entry expires in the DNS server s cache . However, you can also resolve the problem by manually clearing the DNS server s cache .
Tools for Troubleshooting
CHapTER 31
diReCt FRoM tHe SoURCe
looking Up lists of DNS Records
Tim Rains, program Manager
Windows Networking
f you need to frequently check whether numerous DNS records correctly resolve on numerous DNS servers, consider using DNSLint with the ql parameter instead
of Nslookup. This command can test name resolution for specific DNS records across many DNS servers very quickly. DNSLint can also help troubleshoot some DNS issues related to aD DS. DNSLint is a free download available from http://support.microsoft.com/kb/321045/.
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