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DNS lookup seems to have a timeout problem - Windows 2000 Server

Posted on 2006-05-31
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Last Modified: 2013-11-30
Having some problems getting dns resolution of some domains - I think it is a timeout issue, as these particular domains are slow to respond.

On the server, nslookup for a domain xyz works ONLY when the ISP dns server is explicitly stated, AND only after the timeout has been set fairly high.

I think the dns setup is otherwise fine on this server, the only place the ISP dns servers are mentioned is in the forward lookup zone.

Any ideas? thanks Mark
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Question by:mbhh
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Expert Comment

by:Erik Bjers
ID: 16803958
Make sure your ISP DNS servers are listed as forwerders in DNS, and clear the DNS CACHE on the server.

http://www.windowsitpro.com/Article/ArticleID/41229/41229.html
http://www.windowsitpro.com/Article/ArticleID/41229/41229.html

eb
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Author Comment

by:mbhh
ID: 16804764
I added the ISP dns servers into the Forwarders tab of the server properties and it all came right. Does this make good sense or is it just a hack?
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LVL 23

Expert Comment

by:Erik Bjers
ID: 16806391
no this is the way it's sapposed to be done

Your local WS look at your DNS server for name resolution, if your server does not know the answer it has to get the info from somewhere (that's where forwarders come in)


           ---------> WHO IS GOOGLE.COM --------->                  ---------> WHO IS GOOGLE.COM --------->
CLIENT                                                               YOUR DNS                                                               YOUR ISP DNS
          <-------------- 72.14.207.99 <--------------                   <-------------- 72.14.207.99 <--------------

eb
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Author Comment

by:mbhh
ID: 16806465
Yes but how come it was already working for most domains without the forwarders tab settings?

Why did not the ISP dns servers in the Forward Lookup zone not work for all lookups?
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Accepted Solution

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Erik Bjers earned 750 total points
ID: 16806604
What happens is anything your server looks up is stored in it's CACHE so you may have had some lookups alredy stored.

Correct DNS setup in a Win domain is... all clients look at your DNS server as there primary DNS, your DNS server looks at it self as a primary DNS, and you have the forwarders.
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Author Comment

by:mbhh
ID: 16807213
That's odd - the server was installed afresh (by me) only 3 months ago. I thought I had set the dns up correctly there and then, though I could easily have missed the forwarders.

Therefore from what you say ebjers, the forwarders tab MUST have been set up earlier on (for the cache to gain lookup info) and MUST have been recently removed?
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