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NSLOOKUP

NSLookUP

Hello,

I have 2 Windows DNS servers, when the main DNS server is up and I run the command below is fine.

C:\nslookup

Default Server: mytestDNSserver.local

Address: 10.100.5.1

When I shut it down, and I run the same command I get:

C:\nslookup

Default Server: Unknown

However, I still get internet access without the main DNS, the 2nd takes over, but I get the Unknown error.

Any ideas on how to fix this?

Robert

Do you have the secondary DNS set on the NIC.

Does your second dns server have a full replica of the zone?

Qlemo

NSLookup only shows the first DNS server configured (or set with commands/options in NSLookup), not the DNS server answering the request.

SOLUTION

kevinhsieh

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Lizandro Diaz

ASKER

All I want to know is why when I run NSLOOKUP on my client pc I don't see the 2nd DNS server listed as opposed to when the main DNS is online.

Everything works, with the mian DNS online or not.

SOLUTION

kevinhsieh

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Lizandro Diaz

ASKER

@kevin,

So I shouldn't be concerned about nslookup not returning the name of the 2nd dns server?

ASKER CERTIFIED SOLUTION

kevinhsieh

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arnold

Nslookup IP_of_second

Does the reverse zone have the record for the second dns?

Proto Tint

Hi there,
I checked our DNS servers as well, have the same issue, but the main DNS server doesn't display the IP address when i run the NSLOOKUP while its up and running
The result,
Default server: Unknown
Address: 8.8.8.8

but it actually resolves pretty well.
How to back it to its real DNS IP address ?

Seth Simmons

Nslookup IP_of_second

actually you need to put a - in the middle else doing that will just query the address

nslookup 8.8.8.8

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will query that address and tell you it is dns.google

nslookup - 8.8.8.8

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will use that address to run queries against

Lizandro Diaz

ASKER

So, no concerns with this?

Craig Beck

C:\Users\Craig>nslookup /?
Usage:
   nslookup [-opt ...]             # interactive mode using default server
   nslookup [-opt ...] - server    # interactive mode using 'server'
   nslookup [-opt ...] host        # just look up 'host' using default server
   nslookup [-opt ...] host server # just look up 'host' using 'server'

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You can see, just using nslookup with no options uses the default server, which is the primary server on the primary NIC.

Your experienced behaviour is normal.

Lizandro Diaz

ASKER

I know, the dns setup I have works, without the main dns server On. I was just wondering why the 2nd dns doesn't come up when I run NSLOOKUP with the main DNS Off.

I know I can run nslookup (2nd dns IP) and the primary and 2nd will come up.

kevinhsieh

Your screen shot shows exactly what should happen when nslookup can't resolve your DNS server.

Lizandro Diaz

ASKER

Thank you, everyone, for helping me figure out that just because nslookup doesn't display the name of the 2nd dns, doesn't mean is a bad thing.

arnold

It just means the second DNs is missing the DNS record i
the ARPA zone

It is the easiest thing confirm the zone andthe record exist on the second server.