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I cannot perform an nslookup on my network

Posted on 2011-10-16
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Hi

I have 3 computers on my network.
The first machine is a Windows Server 2003 with DNS and has an IP address of 192.168.1.100
The second machine is a Windows Server 2003 that has an IP address of 192.168.1.200
The third machine is an XP computer with an IP address of 192.168.1.1

The problem I'm having is that when I perform an nslookup from the second or third machine it will give me this error message.

DNS request timed out
default server unknown
address: 192.168.1.100

I have already pointed the machines to the DNS server which is 192.168.1.100
but still no luck. When I perform an nslookup on the DNS server it works fine and give me

Default Server: server1.superdomain.com
Address: 192.168.1.100

Thanks
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Question by:techin4
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by:mlchelp
ID: 36977758
can you ping the server? Make sure you have no firewalls turned on.
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by:techin4
ID: 36977783
Hi Michelp,

Thanks, turning off the firewall caused this to work but is it possible to make it work with the
firewall one as I want to add a layer of security for my internal network?
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mlchelp earned 2000 total points
ID: 36977812
you have to open port 53 for tcp and udp, this is the port the pc's will send the request on. Do you really need the firewall turned on on the inside of your network, this will work if you open the port but its not best practice for a server.
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Author Comment

by:techin4
ID: 36977821
I see....What do you suggest? I'm afraid that someone might get a virus which could infect the server as well. This is my biggest concern.

How do people in the real world do it?
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Expert Comment

by:mlchelp
ID: 36977828
Well in all the businesses  that I consult for we run the firewall between the internet and the lan not on each device, make sure you have virus software on all the server and you also need to know who is connecting to your lan and make sure they have virus software as well.
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Author Comment

by:techin4
ID: 36977853
okay it makes sense to me now.

So if my lan is behind my home router (linksys) I should be okay right or would I need to install something like an ISA server?
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by:mlchelp
ID: 36978984
No, as long as you are behind your home router and have the firewall enebled on it you will be fine.
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