DNS Servers

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Microsoft Windows
Tech support
I have recently Changed My ISP. Previously we had a proxy Server which all the browsers where pointed to. The DNS Server on each machine was pointed to the Windows 2000 Server DNS. All Worked Fine. When We changed the ISP we removed the proxy server and replaced it with a firewall. I had to change the DNS Setting to the Firewall which then forwards requests to the IPS DNS. The problem is that occasionally it appears to not do this but if you use IPCONFIG /RENEW it then starts working again. (Any Suggestions) I also since doing this I am having problems with security on Printer sharing but if I change the DNS Server back to the Windows 2000 Server it works fine. I would appreciate any help on either problem Thanks

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This is a common error made by many so don’t get too frustrated!

Rules of the game:

1. Never point local machines to your ISP’s DNS server. The ISP DNS server cannot resolve interal DNS requests.

2. Never set an ISP’s DNS address as a DNS server on any server network adapter.

Knowing the rules here is what you do…

1. Make sure that DNS is installed and running properly on your LAN.

2. Point your DNS server to itself as the primary DNS.

3. Add your ISP’s DNS server addresses as “Forwarders” in your DNS server configuration.

4. Point all other servers and workstations to the DNS server on your LAN.

You’re done.

Discuss This Question: 6  Replies

 
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  • Bridgeman
    Thanks for the info. I have tried this and on the forwarding section of the DNS it is blanked saying the DNS is a root Server and can not have forwarders on it. Is this a problem with the way I have set up the DNS
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  • Marcola
    Since your DNS server is a root server then it will have a list of the internets root DNS hosts. You do not need to add a forwarder to any of the internal DNS servers. I do suggest that you setup a secondary internal DNS server in case you lose your primary. Try the setup that I suggested but do not enter forwarders. This should work fine as long as your new firewall is doing the forwarding as the default gateway. What firewall are you running? How is the DNS configured in your firewall?
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  • Bridgeman
    Sorry to appear stupid but where will I find the Internet Hosts in the DNS system. I am new to this and Inherited the system
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  • Marcola
    Open the DNS manager on your server. Right-Click the server name in the tree view on the left and select properties. Look then under the "Root Hints" tab. If this populated with ?.root-servers.net (? being a,b,c,d etc.) entries then you have the Internet DNS Hosts loaded.
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  • Bridgeman
    Thanks for all your Help the problem is now fixed Regards Bridgeman
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  • Petroleumman
    Hello, An easier method to resolve your situation could be to delete the root zone from your internal DNS and replace it with an AD integrated zone (considering you are running a W2k or later network). Then you will be able to set forwarders for your DNS. A DNS server should only contain a root DNS zone if it is the final stop for resolving DNS queries. If your LAN does not have access to the outside world then this would be a situation in which you would create a root DNS server. Otherwise it is best to use forwarders and let your ISP handle the overhead of maintaining the root zone. As previously mentioned in another post, be sure to point all of your devices (workstations and printers) to your local DNS server. This can be accomplished one of two ways, either manually configure network settings on each device (very labor intense) or set a pointer in your DHCP scope options to use your local DNS server (recommended). Once you set the scope option have everyone reboot to grab the new settings. Good luck!
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