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nslookup returns server unknown

    Question

  • Hello,

    I am not sure if I have a reason to be uncomfortable but the results below do make me uncomfortable. Note that I do not have any problems accessing my network resources and the internet from any program. However...

    Here is the ipconfig on my pc:

       Connection-specific DNS Suffix  . : mydomain.com
       Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6230
       Physical Address. . . . . . . . . : 88-53-2E-30-87-75
       DHCP Enabled. . . . . . . . . . . : Yes
       Autoconfiguration Enabled . . . . : Yes
       IPv6 Address. . . . . . . . . . . : fcee:4:7:9:0:6:3ede:f16d(Preferred)
       Lease Obtained. . . . . . . . . . : Saturday, February 02, 2013 1:32:46 PM
       Lease Expires . . . . . . . . . . : Thursday, February 14, 2013 1:32:45 PM
       Link-local IPv6 Address . . . . . : fe80::3039:a6e1:8fc:9bec%13(Preferred)
       IPv4 Address. . . . . . . . . . . : 192.168.0.162(Preferred)
       Subnet Mask . . . . . . . . . . . : 255.255.255.0
       Lease Obtained. . . . . . . . . . : Sunday, February 03, 2013 12:18:48 PM
       Lease Expires . . . . . . . . . . : Sunday, February 03, 2013 1:18:47 PM
       Default Gateway . . . . . . . . . : 192.168.0.17
       DHCP Server . . . . . . . . . . . : 192.168.0.123
       DHCPv6 IAID . . . . . . . . . . . : 327701294
       DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-18-4C-D3-C3-14-FE-B5-C1-FD-04
       DNS Servers . . . . . . . . . . . : fcee:4:7:9:10::
                                           fcee:4:7:9:11::
                                           192.168.63.122
                                           192.168.63.123
       NetBIOS over Tcpip. . . . . . . . : Enabled
       Connection-specific DNS Suffix Search List :
                                           mydomain.com

    And here is the reason for concern (ran on my pc):

    C:\Windows\system32>nslookup www.yahoo.com
            Server:  UnKnown
            Address:  fcee:4:7:9:10::

            *** UnKnown can't find www.yahoo.com: No response from server

    But if I specify explicitly any of the DNS servers:

            C:\Windows\system32>nslookup www.yahoo.com white
            Server:  white.mydomain.com
            Address:  192.168.63.122

            Non-authoritative answer:
            Name:    ds-any-fp3-real.wa1.b.yahoo.com
            Addresses:  2001:4998:f00b:1fe::3001
                      2001:4998:f00b:1fe::3000
                      2001:4998:f00d:1fe::3001
                      98.139.183.24
            Aliases:  www.yahoo.com
                      fd-fp3.wg1.b.yahoo.com
                      ds-fp3.wg1.b.yahoo.com
                      ds-any-fp3-lfb.wa1.b.yahoo.com

    Or

            C:\Windows\system32>nslookup www.yahoo.com skylark
            Server:  skylark.mydomain.com
            Address:  192.168.63.123

            Non-authoritative answer:
            Name:    ds-any-fp3-real.wa1.b.yahoo.com
            Addresses:  2001:4998:f00b:1fe::3001
                      2001:4998:f00b:1fe::3000
                      98.139.183.24
            Aliases:  www.yahoo.com
                      fd-fp3.wg1.b.yahoo.com
                      ds-fp3.wg1.b.yahoo.com
                      ds-any-fp3-lfb.wa1.b.yahoo.com
                     
    Ping works fine (as any other app out there that I tried):

    C:\Windows\system32>ping www.yahoo.com

            Pinging ds-any-fp3-real.wa1.b.yahoo.com [98.139.183.24] with 32 bytes of data:
            Reply from 98.139.183.24: bytes=32 time=59ms TTL=47
            Reply from 98.139.183.24: bytes=32 time=72ms TTL=49
            Reply from 98.139.183.24: bytes=32 time=121ms TTL=47
            Reply from 98.139.183.24: bytes=32 time=105ms TTL=49

            Ping statistics for 98.139.183.24:
                Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
            Approximate round trip times in milli-seconds:
                Minimum = 59ms, Maximum = 121ms, Average = 89ms

    More about the environment:
            - Very small domain - two AD servers (both Windows Server 2012), two computers (running Windows 8) and three or four devices (printer, phone, WiFi access point, etc.).
            - The network (DHCP, DNS, servers and gateway static addresses etc.) is both IPv4 and IPv6.
            - There are DNS running on both DC servers.
            - The servers have static IPv4 and 6 addresses.
            - The servers have both DNS addresses (both IPv4 and 6) in their IP configuration.
            - Single forward lookup zone - mydomain.com (and of course _msdcs...).
            - Two reverse lookup zones one for IPv4 and one for IPv6.
            - DHCP has the two DNS servers in the options.
           
    Call me old-fashioned but I've been using "nslookup yahoo.com" to diagnose my network problems for years and now when it doesn't answer unless i specify the dns server, makes me nervous. Am I right and if I am can you suggest possible problems in my configrations.


    Thanks Val



    • Edited by Valo Sunday, February 3, 2013 8:17 PM
    Sunday, February 3, 2013 8:15 PM

Answers

  • It's only showing "unknown" for the IPv6 address.

    Go into your IPv6 properties, and set the IP and DNS address settings to be obtained automatically.

    Then in Manage network adapters windows, change the view options to show Menu, then click on Advanced, Advanced, and make sure IPv4 is on top instead of IPv6.


    Ace Fekay
    MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services
    Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/

    This post is provided AS-IS with no warranties or guarantees and confers no rights.

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    Monday, February 4, 2013 6:01 AM

All replies

  • It's only showing "unknown" for the IPv6 address.

    Go into your IPv6 properties, and set the IP and DNS address settings to be obtained automatically.

    Then in Manage network adapters windows, change the view options to show Menu, then click on Advanced, Advanced, and make sure IPv4 is on top instead of IPv6.


    Ace Fekay
    MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services
    Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/

    This post is provided AS-IS with no warranties or guarantees and confers no rights.

    FaceBook Twitter LinkedIn

    Monday, February 4, 2013 6:01 AM
  • Everything was exactly the way you suggested... Then I played with the order: v6 before v4 just to try and see - got worse. Reversed back to v4 before v6 - and almost all is looking good with the exception of Server: UnKnown (like I said in the original post I do have rev. lookup zone). But this is something I can live with (unless you or somebody else has other suggestion). I am marking your reply as the solution.

    Thank you very much!


    Thanks Val

    Tuesday, February 5, 2013 3:19 PM
  • I'm sure you've figured this out by now. Although the recommendation from ACE is correct there is possibly another issue. 

    1. Open Network and Sharing Center
    2. Change adapter settings.
    3. Selection connection, right-click and choose properties of the network connection.
    4. Double-click the IPv6 tcpip settings.

    Determine if your IPv6 setting is as shown. If so, change it to "Obtain DNS server ..."


    LMC

    Tuesday, December 17, 2013 3:13 PM