nsloookup doesn't show a default server

I am a newbie to some of the networking items that so many of you have known for years.

I have a new SBS2008 server. When I go to the command prompt and type nslookup the program responds with
 "Default Server:  UnKnown"
How do I tell nslookup that I am on the DNS server?
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Chris DentConnect With a Mentor PowerShell DeveloperCommented:

Hey :)

Are you referencing the DNS server by the IPv6 address above? You'll need a Reverse Lookup Zone for that as well if you are.

If you're just using IPv4... head to the DNS Console then:

1. Select Reverse Lookup Zones

2. See if a zone called "192.168.2.x Subnet" or 2.168.192.in-addr.arpa exists (both are the same thing)

3. If it doesn't...
  a. Right click and select New Zone
  b. Select Primary and tick Store in Active Directory (if appropriate)
  c. Select the replication scope, All DNS Servers in the AD Domain would be my choice
  d. Allow Dynamic Updates
  e. Finish
  f. Open the Command Prompt on the server and run: ipconfig /registerdns
  g. In the DNS Console again, refresh the view of the new zone (F5) and confirm that a new PTR record has appeared for the servers IP address

4. If it does already exist
  a. Select the zone and see if a PTR record for the servers IP address exists
  b. If it does not (and the error above would indicate that it doesn't)...
  c. Right click on the zone and select Properties
  d. Verify that Dynamic Updates is set to Secure Only (Win 2003 or 2008)

Which just leaves the question of IPv6. Do you wish to support that on your network?

Chris DentPowerShell DeveloperCommented:


All that means is that it failed to find the server name when looking up the IP Address. It's the equivalent of:


Where should be replaced with the server IP.

You can fix it by ensuring a Reverse Lookup Zone exists for your subnet (like "192.168.1.x Subnet" or 1.168.192.in-addr.arpa depending on your view options) in the DNS Console. If it does, verify that a PTR record exists for your server.


nslookup server dns_server_ip_or_name

- gurutc
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LostInWindowsAuthor Commented:
This is weird! There must be something very simple and fundamental that I missed in set-up, Could you assist with this? This command was run from the server with both admin and non-admin privelage, both returned the same result.

Server:  UnKnown
Address:  fd30::9631:b7f6:e3da:603d

*** UnKnown can't find Non-existent domain

if is the dns server, type nslookup server

that will tell it to use the dns server as the default lookup server, and it will test to see if the dns level connectivity is present in the TCPIP stack.

- gurutc
LostInWindowsAuthor Commented:
I disabled IPv6 and everything works the way I would expect it to. THANK YOU!!
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