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DNS Recursion Issue

    Question

  • Hello everybody,

    I have single forest single domain environment that is experiencing an external DNS recursion issue.

    Our DNS servers are 2008r2.

    Internal DNS name lookups are working without issue but when trying to resolve anything external, we get multiple time outs.

    Pinging external domain names does work but is slow, nslookup to external domain names will either timeout out once or twice before succeeding or fail all together and when loading a website in a browser it may timeout and say DNS failed before finally loading.

    Recursion is turned on.

    Simple recursion tests pass on the DNS server and the forwarders are configured and valid.

    I need assistance with this please.

    Thank you.


    Wednesday, December 14, 2016 10:02 PM

All replies

  • Hi

     First check the similar case;

    https://social.technet.microsoft.com/Forums/office/en-US/6b504838-daec-4771-ada3-391264d92861/help-slow-external-dns-resolving-time?forum=winservergen

    Check dns ip,isp line health,also FW side.

    And also check this case; https://www.experts-exchange.com/questions/28016281/Windows-Server-2008R2-DNS-causing-slow-web-browsing.html


    This posting is provided AS IS with no warranties or guarantees,and confers no rights. Best regards Burak Uğur

    Thursday, December 15, 2016 6:40 AM
  • Hi SouuthernGuy,

    As a workaround, I would recommend you configure forwarder with a public DNS server address on the internal DNS server. And it's a general configuration if we want to visit public network via internal DNS server.

    Best Regards,

    Anne


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Thursday, December 15, 2016 8:15 AM
    Moderator
  • Hi,

    Just to check if the above reply be of help? If yes, you may mark useful reply as answer, if you need additional assistance, welcome to feedback.

    Best Regards,

    Anne


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Tuesday, January 10, 2017 8:27 AM
    Moderator