Configure a DNS Server to Use Forwarders for domain work internal network as well as external network

Configuring a DNS server to use forwarders

• Using the Windows interface
  
  
• Using a command line
  
  

To configure a DNS server to use forwarders using the Windows interface

1. Open DNS Manager.
   
2. In the console tree, click the applicable DNS server.
   Where?
   
   • DNS/Applicable DNS server
     
3. On the Action menu, click Properties.
   
4. On the Forwarders tab, under DNS domain, click a domain name.
   
5. Under Selected domain's forwarder IP address list, type the IP address of a forwarder, and then click Add.
   

Additional considerations

• To open DNS Manager, click Start, point to Administrative Tools, and then click DNS.
  
• To create a new domain name, click New, and then, under DNS domain, type the domain name.
  
• When you specify a conditional forwarder, select a DNS domain name before you enter an IP address.
  
• By default, the DNS server waits five seconds for a response from one forwarder IP address before it tries another forwarder IP address. In Number of seconds before forward queries time out, you can change the number of seconds that the DNS server waits. When the server has exhausted all forwarders, it attempts standard recursion.
  
• If you want the DNS server to only use forwarders and not attempt any further recursion if the forwarders fail, select the Do not use recursion for this domain check box.
  
  You can disable recursion for the DNS server so that it will not perform recursion on any query. If you disable recursion on the DNS server, you will not be able to use forwarders on the same server.
  
• Do not enter a forwarder's IP address more than once in a DNS server's forwarders list because it is a more reliable or geographically closer server. If you prefer one of the forwarders, put that forwarder first in the series of forwarder IP addresses.
  
• You cannot use a domain name in a conditional forwarder if the DNS server hosts a primary zone, secondary zone, or stub zone for that domain name. For example, if a DNS server is authoritative for the domain name corp.contoso.com (that is, it hosts the primary zone for that domain name), you cannot configure that DNS server with a conditional forwarder for corp.contoso.com.
  
• You can prevent common problems that are associated with forwarders by configuring your DNS servers to avoid overusing your forwarders.
  

To configure a DNS server to use forwarders using a command line

1. Open a command prompt.
   
2. Type the following command, and then press ENTER:
   
   dnscmd  /ResetForwarders  [/TimeOut ] [/Slave] 

   http://technet.microsoft.com/en-us/library/cc754941.aspx