Checking the Domain Name Services (DNS)

Article:TECH79171  |  Created: 2001-01-15  |  Updated: 2012-08-13  |  Article URL http://www.symantec.com/docs/TECH79171
Article Type
Technical Solution


Issue



You need to know how to check DNS services on your server are available and configured correctly.

 


Solution



The primary function of DNS is to resolve the Internet name to an IP address. This process uses a fully qualified domain name (FQDN). Use the sections that follow to verify the FQDN and test DNS.

 


Note: The FQDN does not need to be resolvable outside of the internal network.




To verify the FQDN

  1. On the Windows taskbar, click Start > Run.
  2. In the Open: box, type the following text:

    cmd.exe

  3. Click OK.
  4. In the cmd.exe window, type the following command:

    nslookup <ip address of the server> 

  5. Press Enter.
  6. The following responses are returned:

    Server: <the name of the server>
    Address: <the IP address of the server>

     


 


Notes:

  • If you use a proxy server, the nslookup can return the proxy server name and address.
  • These are the only responses that are acceptable.
  • A fully qualified domain name will appear in the form: proxyserver.domain.com.
  • The name proxyserver is not necessary, it could be represented as www.domain.com, and still be valid.



To confirm the external addresses resolve in a timely manner

  1. Open a command prompt.
  2. At the prompt type the following commands and press Enter after each command:
    nslookup
    set type=mx
    symantec.com
  3. Repeat step 2 and substitute yahoo.com for symantec.com
  4. If errors occur contact your administrator to fix any DNS problems.





 



Legacy ID



2001081514544954


Article URL http://www.symantec.com/docs/TECH79171


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