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Server and client DNS Servers

    Question

  • For our servers and workstations, we have a primary and secondary DNS entry. During the weekend, we temporarily lost connectivity to both DNS servers. As a result, I could not log-into Exchange and other servers because it could not find a DC through DNS.  I know that secondary server will only be used if the primary is non-responsive. If I put a 3rd, 4th, 5th, and 6th DNS servers for our servers and clients, would this create any DNS flooding? Although there are 6 entries, only one will be use given that the 1st server or the 2nd and so fourth does not respond. 
    Monday, November 28, 2011 8:38 PM

Answers

  • Hello,

    does the other servers have a copy of your DNS zones? If yes then add them in IP settings of your client computers so that if the two DNS servers was non responsive, the other ones will be used for DNS resolution.

    If no then there is no need to add them.

     


    This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

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    Monday, November 28, 2011 8:43 PM
  • Hi,

    Your correct. It'll always be only one DNS Server that respond to your request. If fails, it'll go for any other added DNS servers for the resolution.


    Thamara. MCTS, MCITP Ent Admin, Specialized in U.C Voice OCS 2007 R2
    Tuesday, November 29, 2011 2:37 AM
  • First the client computer will try to resolve the name or ip from host file of the computer, if there is no records then it will search from primary dns server. If the primary dns server is failed then it will connect to the secondary or available dns server.

     

     


    Darshana Jayathilake
    Tuesday, November 29, 2011 4:15 AM
  • That's what I'm planning. A client will only query 1 DNS Server. If that server responds, the other ones listed are not queried...right?

    Yes right.

    Please make sure that you will use the correct order to avoid latency.

     


    This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

    Microsoft Student Partner 2010 / 2011
    Microsoft Certified Professional
    Microsoft Certified Systems Administrator: Security
    Microsoft Certified Systems Engineer: Security
    Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration
    Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration
    Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration
    Microsoft Certified Technology Specialist: Windows 7, Configuring
    Microsoft Certified Technology Specialist: Designing and Providing Volume Licensing Solutions to Large Organizations
    Microsoft Certified IT Professional: Enterprise Administrator
    Microsoft Certified IT Professional: Server Administrator
    Microsoft Certified Trainer

    Tuesday, November 29, 2011 9:54 PM

All replies

  • Hello,

    does the other servers have a copy of your DNS zones? If yes then add them in IP settings of your client computers so that if the two DNS servers was non responsive, the other ones will be used for DNS resolution.

    If no then there is no need to add them.

     


    This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

    Microsoft Student Partner 2010 / 2011
    Microsoft Certified Professional
    Microsoft Certified Systems Administrator: Security
    Microsoft Certified Systems Engineer: Security
    Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration
    Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration
    Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration
    Microsoft Certified Technology Specialist: Windows 7, Configuring
    Microsoft Certified Technology Specialist: Designing and Providing Volume Licensing Solutions to Large Organizations
    Microsoft Certified IT Professional: Enterprise Administrator
    Microsoft Certified IT Professional: Server Administrator
    Microsoft Certified Trainer

    Monday, November 28, 2011 8:43 PM
  • That's what I'm planning. A client will only query 1 DNS Server. If that server responds, the other ones listed are not queried...right?
    Monday, November 28, 2011 9:31 PM
  • Hi,

    Your correct. It'll always be only one DNS Server that respond to your request. If fails, it'll go for any other added DNS servers for the resolution.


    Thamara. MCTS, MCITP Ent Admin, Specialized in U.C Voice OCS 2007 R2
    Tuesday, November 29, 2011 2:37 AM
  • First the client computer will try to resolve the name or ip from host file of the computer, if there is no records then it will search from primary dns server. If the primary dns server is failed then it will connect to the secondary or available dns server.

     

     


    Darshana Jayathilake
    Tuesday, November 29, 2011 4:15 AM
  • That's what I'm planning. A client will only query 1 DNS Server. If that server responds, the other ones listed are not queried...right?

    Yes right.

    Please make sure that you will use the correct order to avoid latency.

     


    This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

    Microsoft Student Partner 2010 / 2011
    Microsoft Certified Professional
    Microsoft Certified Systems Administrator: Security
    Microsoft Certified Systems Engineer: Security
    Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration
    Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration
    Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration
    Microsoft Certified Technology Specialist: Windows 7, Configuring
    Microsoft Certified Technology Specialist: Designing and Providing Volume Licensing Solutions to Large Organizations
    Microsoft Certified IT Professional: Enterprise Administrator
    Microsoft Certified IT Professional: Server Administrator
    Microsoft Certified Trainer

    Tuesday, November 29, 2011 9:54 PM