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nslookup shows unknown server when IPv6 protocol enabled on SBS2008 server

Posted on 2010-08-29
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Last Modified: 2012-05-10
We have just migrated an sbs2003 to sbs2008, and when we ran nslookup on the sbs2008, we got an unknown server message and what looks like an IPv6 address.

If I dissable the IPv6 protocol on the sbs2008 network card it works fine.

We have installed several SBS servers now, and can't remember having to do this before.

Can anyone advise how to fix this, why it happens and what are the implications of running with IPv6 dissabled on the new SBS2008 server.

Any ideas?

Thanks.
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Question by:nigelbeatson
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LVL 17

Expert Comment

by:aoakeley
ID: 33552419
Do not disable IP6 on an sbs server, it will break a lot of things.

If you use NSLOOKUP from a host that supports IPv6 then the IPv6 address will be returned, if you do it from an IPv4 host, then the IPv4 address will be returned. This is by design.

Andy
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LVL 17

Expert Comment

by:aoakeley
ID: 33552421
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Author Comment

by:nigelbeatson
ID: 33552499
OK Thanks. I have just checked one of our other servers and you are correct, it does respond with the IPv6 details.

However, both of these servers also say that the server is unknown along with the IPv6 address.

Is this this normal, as it feels to me that there is something wrong?

If I enter the names of the server and IP adresses it comes back with the correct information along with the server unknown and IPv6 address info.

Can you confirm whether this is correct?
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LVL 17

Expert Comment

by:aoakeley
ID: 33552692
Can you post a screenshot of the nslookup?
If i understand what you are saying.... I think you are saying is that there is no reverse DNS for the IPv6 address. This will not be a concern for the operation of the network.

Andy
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Accepted Solution

by:
aoakeley earned 500 total points
ID: 33552710
Just did this on one of my SBS2008 servers

C:\Users\SysAdmin>nslookup
Default Server:  UnKnown
Address:  fe80::4719:1cb1:4feb:6eac

And confirmed that on a default SBS Server install there is no IPv6 reverse DNS zone. thus the "unknown" response (see attached screenshot).

You could create an ipv6 reverse lookup zone, but if MS did not consider it needed either in the release or in subsequent update I reckon we can not worry about it


Capture.JPG
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Author Closing Comment

by:nigelbeatson
ID: 33552858
Once again many thanks.
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