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NSLookup appending parent suffixes in Active Directory

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Last Modified: 2011-09-20
In the past week we've noticed that all our NSLookups are appending the parents domain suffixes for example:
"NSLookup server.domain.net.nz" :- returns

Server: domaincontroller.domain.net.nz
Address: 10.x.x.x

Non-authoritative answer:
Name: server.domain.net.nz.net.nz
Address: 202.xx.xx.xx

The 202.xx.xx.xx.xx Address actually belongs to nz.net.nz, which is nothing to do with our company.

Now this has just started happening all the IT Admins swear they haven't changed anything and there have been no other known changes.  One of our IT Admins has an Active Directory Setup at home and he's also having the same problems.  We know we can apply a fix for this automatically via Group Policy and/or manually via TCP/IP (Advanced - DNS) Properties, by changing the "Append these DNS suffixes (in order)":.  But the question is why has it started happening all of a sudden and is it possible to change it, without going through Group Policy or TCP/IP Properties.

Cheers
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A little dot at the and could help:

nslookup server.domain.net.nz.     <- end with dot
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Commented:
Hi cheeselover73

Thanks for the response, yes the period at the end also works, however my main objective is to figure out why all of sudden it changed, as no period was required previously.

Cheers
can you paste ipconfig /all
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Commented:
Windows IP Configuration
        Host Name . . . . . . . . . . . . : XXX-X-XXXXXX
        Primary Dns Suffix  . . . . . . . : domain.net.nz
        Node Type . . . . . . . . . . . . : Hybrid
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : domain.net.nz
                                            DOMAIN.NET.NZ
                                            net.nz
Ethernet adapter Local Area Connection:
        Connection-specific DNS Suffix  . : domain.net.nz
        Description . . . . . . . . . . . : Broadcom NetXtreme 57xx Gigabit Controller
        Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-XX
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 10.2.1.22
        Subnet Mask . . . . . . . . . . . : 255.255.0.0
        Default Gateway . . . . . . . . . : 10.2.255.254
        DHCP Server . . . . . . . . . . . : 10.2.1.1
        DNS Servers . . . . . . . . . . . : 10.2.1.1
                                            10.1.1.1
        Primary WINS Server . . . . . . . : 10.1.1.1
        Lease Obtained. . . . . . . . . . : Tuesday, 30 September 2008 3:43:05 p.m.
        Lease Expires . . . . . . . . . . : Wednesday, 8 October 2008 3:43:05 p.m.
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