Nslookup returns server unknown
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
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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