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Small Business Server 2003 - Slow DNS

Posted on 2009-05-09
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I just installed a new SBS 2003 server (Dual Xeon 2.4  GHz and 4 GB RAM) and made it the gateway between the LAN and the outside world (public IP on the External Network NIC).  The office consists of approximately 15 PCs.  Obviously the SBS server is a DC, but the PCs all currently run XP Home, so none of them can join the domain.  This will be corrected a few PCs at a time over the next 6 months or so, but cannot be corrected immediately.  Since installing the SBS server and making it the sole DNS server on the desktops, internet connectivity has been incredibly slow.  It takes forever for a page to begin to load.  Once it finally started actually loading it seemed to load quickly.  I finally tracked this down to being a DNS issue.  On a client, if I do an "nslookup www.cnn.com" for example, I comes back in about 2-3 seconds and says it lists the server as the DNS server that it checked with, but says it couldn't resolve the address.  If I then wait another 3-4 seconds and try again, it still says the SBS server couldn't resolve it, but give a non-authoritative response with the IP of the CNN.com.  So it seems that the holdup with websites loading up-front is that the browser is waiting on the IP to resolve.  Other than re-running CEICW again, does anyone have any suggestion as to why it's taking the server so long to resolve external addresses?  Thank you in advance for any advice or assistance.
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Question by:kylerogers
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DTAHARLEV earned 500 total points
ID: 24346541
Well, the reverse lookup isn't what is slowing it down, it does this only when you put in the query; BUT, can you paste a printout of what it shows exactly? is it trying to use your DNS server? are they answering?

Perhaps they're just not answering, after which it's going out to the secondary; OR, your DNS servers only query the root servers, which causes replies to come back slow (i.e. there are no forwarders configured)
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by:kylerogers
ID: 24346581
This is the output from one of the clients.  I waited around 5 seconds before making the second nslookup request.  The only DNS server that that the client has defined on its NIC is the SBS IP (192.168.1.2).


C:\Documents and Settings\user>nslookup www.experts-exchange.com
*** Can't find server name for address 192.168.1.2: Non-existent domain
*** Default servers are not available
Server:  UnKnown
Address:  192.168.1.2
 

DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out


C:\Documents and Settings\user>nslookup www.experts-exchange.com

*** Can't find server name for address 192.168.1.2: Non-existent domain
*** Default servers are not available
Server:  UnKnown
Address:  192.168.1.2
 

Non-authoritative answer:
Name:    experts-exchange.com
Address:  64.156.132.140
Aliases:  www.experts-exchange.com

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by:DTAHARLEV
ID: 24346594
send the printout of an ipconfig /all please

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by:kylerogers
ID: 24346628
Actually, I just figure out the problem.  When I originally set up the server, I had to do it off-site at my house and them move it to their office.  So I brought up the server on my home's subnet.  I thought I caught all of the DNS stuff once I changed the server's IP, but I missed the DNS forwarders.  It was trying to forward request to its old IP address before forwarding it on to the public DNS server.  I simply removed the old IP address from the forwarder list and it fixed the problem.  
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by:DTAHARLEV
ID: 24346754
giddiup
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