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DNS query walking RRS feed

  • Question

  • Does anyone know how DNS query do tree walking? For example, we have dns infrastructure like this:

    123.com

    456.123.com

    It seems that any servers or workstations at 456.123.com and without additional suffix 123.com will not find the objects at 123.com. I know the fix but I would like to know really how dns does tree walking. Can someone help?

    Thank you very much,

    Monday, December 11, 2017 7:25 PM

All replies

  • Hi ,

    In simplification the evaluation is done from right to left. So DNS will first search if it hosts Forward Lookup Zone of 123.com, if the Forward Lookup Zone does exist it will return IP from A record.

    The search suffix is used by the client side resolver to “suffix” a DNS query. 
    If you were to ping a hostname called “serverName,” if a search suffix has been configured, whether automatically (being joined to a domain), or manually, it will “suffix” the search suffix to your query. 

    For your reference:

    How DNS Works

    https://technet.microsoft.com/en-us/library/cc772774%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396

    Configuring DNS Search Suffixes (Published by Ace Fekay)

    https://blogs.msmvps.com/acefekay/2011/02/12/configuring-dns-search-suffixes/

    Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

    Best Regards,

    Candy


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    Tuesday, December 12, 2017 3:00 AM
  • Thank you very very much for your response. Based on the theory of walking from right to left, when the object sits on 456.123.com, will it NOT query by walking up to 123.com?

    Thank you!!!!!

    Tuesday, December 12, 2017 5:13 PM
  • Hi ,

    >>123.com

    456.123.com

    >> when the object sits on 456.123.com

    I am confused about something. The 456.123.com is a child domain of 123.com or it is a FQDN?

    FQDN=hostname+suffix=456 + 123.com

    If 456.123.com is a child domain of 123.com, when the object sits on 456.123.com, DNS will query Forward Lookup Zone of 456.123.com.

    If 456.123.com is a FQDN, DNS will search if it hosts Forward Lookup Zone of 123.com and then return IP from A record of 456.

    Best Regards,

    Candy

     


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    Wednesday, December 13, 2017 7:38 AM
  • Hi ,

    

    Just want to confirm the current situations.

     

    Please feel free to let us know if you need further assistance.

                       

    Best Regards,

    Candy


    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 14, 2017 6:16 AM
  • Hi ,

    Was your issue resolved?

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    Best Regards,

    Candy


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    Thursday, December 14, 2017 10:22 AM