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DNS Cache RRS feed

  • Question

  • Hi All,

    Due to previous issues we are thinking of clearing the cache on all our DNS servers on our estate together with some client machines. Before I embark on the cache clearing on servers I would like to know what effect it will have on the system and on the server itself, since I think there must be quite a few thousand entries as we have a very large estate.

    Any information would be greatly received.

    Regards.

    Thursday, April 18, 2019 11:30 AM

Answers

  • Hi,

    Thanks for your question.

    The DNS cache is a record of domain names converted into IP addresses during Web browsing and similar activities. The cache makes accessing these IP addresses faster by remembering the IP instead of having to look it up based on the entered domain.

    Cleaning up your cache is also a reasonable maintenance practice. DNS cache data doesn't take up much space, but the list can get very long if you don't clear the cache for a long time. Sites you no longer visit can be expunged and free up space for new entries. This can also prevent the cache from returning bad results and 404 errors when revisiting old websites, as old IP addresses may not reflect the current website addresses. 

    Best Regards,

    Eric


    Please remember to mark the replies as answers if they help and unmark them if they provide no help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by czql5v Thursday, April 25, 2019 6:30 AM
    Thursday, April 18, 2019 12:43 PM

All replies

  • Hi,

    Thanks for your question.

    The DNS cache is a record of domain names converted into IP addresses during Web browsing and similar activities. The cache makes accessing these IP addresses faster by remembering the IP instead of having to look it up based on the entered domain.

    Cleaning up your cache is also a reasonable maintenance practice. DNS cache data doesn't take up much space, but the list can get very long if you don't clear the cache for a long time. Sites you no longer visit can be expunged and free up space for new entries. This can also prevent the cache from returning bad results and 404 errors when revisiting old websites, as old IP addresses may not reflect the current website addresses. 

    Best Regards,

    Eric


    Please remember to mark the replies as answers if they help and unmark them if they provide no help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by czql5v Thursday, April 25, 2019 6:30 AM
    Thursday, April 18, 2019 12:43 PM
  • Hi,

    Just checking in to see if the information provided was helpful.

    Please let us know if you would like further assistance.

    Best Regards,

    Eric


    Please remember to mark the replies as answers if they help and unmark them if they provide no help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Wednesday, April 24, 2019 5:02 PM