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DNS problem in SBS Network

Posted on 2007-09-28
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Hi All,

For the last month we have been getting internet drop outs and I think it may relate to a DNS problem on our server/network. I have called up our ISP and they have already checked the ADSL line that we use and given it the all clear fault wise. Our SBS server has two DNS forwarders configured and each client pc has static IPs and the server as the prefered DNS server.

The reason why I think this may be a DNS problem, is that I have tried to ping IPs and they all return successfully while using http://www.domain.com fails. The problem seems to be intermitent and will last for 5-10 mins then IE7 will accept domain or IP. Does anyone have any ideas as to what may be happening?
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Question by:rmullins83
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markpalinux earned 2000 total points
ID: 19978523


I would suggest you may want to remove the forwarders and go with straight to the root servers, or use different forwarders - there is no real cost and with the number of root servers they seem to handle things ok.

I would suggest taking a look at - http://www.opendns.com/ - seems like a lot of people are happy with the DNS services they provide.

You can test dns by
nslookup -type=A www.domain.com dns-forwarder-ip-#1  
nslookup -type=A www.domain.com dns-forwarder-ip-#2

See if they give the proper response

Remember Windows cache dns names -
ipconfig /displaydns
ipconfig /flushdns

Mark
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by:rmullins83
ID: 19978645
Ok removing the forwarders should be a problem. How can I do the straight to root servers option? Is that specifying dns servers in each client's pc tcp/ip settings??
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by:rmullins83
ID: 19978670
Just tried the nslookup option in cmd and got an error

***Can't find server address for 'dns-forwarder-ip-#1'***
Server: server.domain.local
Address: 192.168.1.X

DNS request timed out.
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Author Comment

by:rmullins83
ID: 19978730
Just tried the open dns ips as the forwarders get the same message bu instead of the dns request timing out, I get a non-authoriative answer with dns information for the domain. Is that right?
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Expert Comment

by:markpalinux
ID: 19979341
Yes the non-authoriative answer message means that the DNS server does not own the domain, but that you asked it and that it did a recursive lookup for you.

Mark
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