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05.09.2008 at 12:38PM PDT, ID: 23390613
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DNS setup:  does my DNS server need the address of my ISP's DNS server?

Tags: Microsoft, Server, SBS 2003, DNS
I've been reading historical DNS questions/answers here at EE, but can't seem to find this detail.

Does my local DNS server (SBS 2003) need to know what my ISP's DNS server addresses are?  Intuitively I feel like it has to know somehow, but I can't find  this information listed in any DNS settings windows.

A few months ago the server changed locations and ISP.  I didn't make changes to any server settings but everything seems to work.  The only change I made was to the WAN side of the firewall: static IP, subnet, gateway, DNS servers.
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Question Stats
Zone: Networking
Question Asked By: telefunken
Solution Provided By: leew
Participating Experts: 2
Solution Grade: A
Views: 18
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05.09.2008 at 12:45PM PDT, ID: 21535898

Rank: Genius

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05.09.2008 at 12:49PM PDT, ID: 21535923

Rank: Wizard

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05.09.2008 at 12:45PM PDT, ID: 21535898

Rank: Genius

Strictly speaking, no.  In the TCP/IP properties of the server, you should ONLY have the SBS server's local IP address.  Then in the DNS Servers properties, you would configure your ISP servers as forwarders - this is a common practice.  HOWEVER, strictly speaking, it's unnecessary.  The SBS DNS server can query the root servers for you.

Likewise, all your clients should obtain DNS from DHCP and the only DNS server they should be aware of is the DNS server of the SBS system.

I would suggest you read over some of the links on the my DNS web page - see:

http://www.lwcomputing.com/tips/static/dns.asp

(In theory, if you use the appropriate wizard, the DNS is properly setup for you).
Accepted Solution
 
05.09.2008 at 12:49PM PDT, ID: 21535923

Rank: Wizard

It would help things if the ISP's DNS servers were programmed in, but it isn't required. On an Active Directory network such as an SBS, all workstations should point towards the SBS server as the only DNS server in the network (unless you have a more complex setup with a second standard 2003 server DC). The DNS server is then responsible for looking up and returning the correct DNS records as requested by the client; either directly, if it is authoritive for the requested namespace, or by looking up the record on a remote DNS server if not.

The two methods of forwarding requests out to public DNS servers when the lookup request isn't for your SBS internal domain are by using either forwarders or root hints. A root hint uses one of the 12 or so root name servers as the first point of call, querying the nameservers for each record each time as it moves up towards the correct nameserver you're looking for. This process is time consuming (it has to query lots of different nameservers in turn) and uses bandwidth (since it's a separate query to each DNS server), but it does work if forwarders don't for whatever reason.

The forwarders option allows you to specify one or more nameservers at your ISP as the place to forward ALL unresolved lookup requests to. In the case of larger ISPs, these nameservers are likely to have a much larger cache of DNS entries and can quickly return a record. Also, it's less bandwidth using, since it's only one query to the ISP's server.

If you changed DNS servers in the firewall, I suspect the SBS may be pointing to that device (which is proxying the requests to the ISP) or it may be using root hints. You can check in Start, Administrative Tools, DNS, click the <server name> container, double-click Forwarders. The IP addresses listed here (if any) are the DNS forwarders, none = root hints are used. I suggest you add one or more ISP DNS servers here.
Assisted Solution
 
 
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