Network Administration: The netdiag Utility

netdiag is a powerful, network-testing utility that performs a variety of network diagnostic tests that can help you to pinpoint a networking problem. The output listing below shows the output from a typical execution of the Netdiag command. You can scan this listing to see the types of tests that the netdiag command performs.

Unfortunately, the netdiag command is not available for Windows 9x computers (including Windows Me), and it isn’t installed by default in Windows XP or Vista. However, you can install it in Windows XP or Vista by inserting your Windows installation disc in your computer’s optical drive. If you’re asked to reinstall Windows, say no. Instead, choose to browse the install CD. Navigate your way down to the \Support\Tools folder on the install CD and then double-click the Setup.exe icon in the \Support\Tools folder.

The netdiag command has several switches that let you control the output generated by the command:

• /q: Lists only those tests that fail

  
  



• /v: Generates verbose output (even more verbose than usual)

  
  



• /debug: Generates extremely verbose output way more than when you use /v

  
  



• /l: Stores the output from the command in a file named NetDiag.log

  
  



• /fix: Attempts to fix DNS problems that are discovered

  
  

Output from the netdiag Command

...............................
    Computer Name: DOUG
    DNS Host Name: Doug
    System info : Windows 2000 Professional (Build 2600)
    Processor : x86 Family 15 Model 2 Stepping 4, GenuineIntel
    List of installed hotfixes :
        Q147222
        Q308677
        Q308678
        Q310601
        Q311889
        Q315000
Netcard queries test . . . . . . . : Passed
Per interface results:
    Adapter : Local Area Connection
        Netcard queries test . . . : Passed
        Host Name. . . . . . . . . : Doug
        IP Address . . . . . . . . : 192.168.168.21
        Subnet Mask. . . . . . . . : 255.255.255.0
        Default Gateway. . . . . . : 192.168.168.254
        Dns Servers. . . . . . . . : 192.168.168.10
                                     168.215.210.50
                                     192.9.9.3
        AutoConfiguration results. . . . . . : Passed
        Default gateway test . . . : Passed
        NetBT name test. . . . . . : Passed
        WINS service test. . . . . : Skipped
            There are no WINS servers configured for this interface.
Global results:
Domain membership test . . . . . . : Passed
    Dns domain name is not specified.
    Dns forest name is not specified.
NetBT transports test. . . . . . . : Passed
    List of NetBt transports currently configured:
        NetBT_Tcpip_{4A526104-BAEB-44F0-A2F6-A804FE31BBAA}
    1 NetBt transport currently configured.
Autonet address test . . . . . . . : Passed
IP loopback ping test. . . . . . . : Passed
Default gateway test . . . . . . . : Passed
NetBT name test. . . . . . . . . . : Passed
Winsock test . . . . . . . . . . . : Passed
DNS test . . . . . . . . . . . . . : Passed
Redir and Browser test . . . . . . : Passed
    List of NetBt transports currently bound to the Redir
        NetBT_Tcpip_{4A526104-BAEB-44F0-A2F6-A804FE31BBAA}
    The redir is bound to 1 NetBt transport.
    List of NetBt transports currently bound to the browser
        NetBT_Tcpip_{4A526104-BAEB-44F0-A2F6-A804FE31BBAA}
    The browser is bound to 1 NetBt transport.
DC discovery test. . . . . . . . . : Skipped
DC list test . . . . . . . . . . . : Skipped
Trust relationship test. . . . . . : Skipped
Kerberos test. . . . . . . . . . . : Skipped
LDAP test. . . . . . . . . . . . . : Skipped
Bindings test. . . . . . . . . . . : Passed
WAN configuration test . . . . . . : Skipped
    No active remote access connections.
Modem diagnostics test . . . . . . : Passed
IP Security test . . . . . . . . . : Passed
    Service status  is: Started
    Service startup is: Automatic
    IPSec service is available, but no policy is assigned or active
    Note: run “ipseccmd /?” for more detailed information
The command completed successfully

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