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dns nslookup issue - hostname vs fqdn RRS feed

  • Question

  • Hello,

    what could be the reason if i get different answers when i try to make a nslookup with hostname and with a Fqdn:

    Example:

    Test 1)

    nslookup client01

    answer: client01.mydomain.com with ip 192.168.5.50 -> correct

    Test 2)

    nslookup client01.mydomain.com

    answer: foreignClient.foreignDomain.com -> 85.120.xxx.xxx -> not correct, its a public ip and host not from out Company

    in debug mode:

    nslookup client01.mydomain.com

    Question: foreignClient.foreignDomain.com.foreignDomain.com -> why Domain.domain ?

    thank you!


    • Edited by kc84 Tuesday, November 27, 2018 11:46 AM
    Tuesday, November 27, 2018 11:23 AM

All replies

  • Hi,

    Is a DNS suffix foreignDomain.com in the suffixes list?

    Which DNS server the client used to resolve the FQDN?

    Have you set local DNS server as preferred DNS server?

    Best regards,

    Travis


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    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com

    Wednesday, November 28, 2018 2:15 AM
    Moderator
  • Hi,

    Is a DNS suffix foreignDomain.com in the suffixes list? 

    -> NO

    Which DNS server the client used to resolve the FQDN?

    First our local Windows dns Server (our Domain in this case would be: test.mydomain.co.at)

    Question: myClient.test.mydomain.co.at.test.mydomain.co.at(funny why test.mydomain.co.at.test.mydomain.co.at)

    answer from: Primary Name Server: dns.mydomain.co.at (local Windows dns Server)

    Question: myclient.test.mydomain.co.at.mydomain.co.at

    answer from: Primary Name Server: ns1.mydomain.com (Linux bind9)

    Question: myclient.test.mydomain.co.at.co.at

    answer from: Primary Name Server: dnsserverfrom.at.co.at domain

    Name: myclient.test.mydomain.co.at.co.at

    public IP

    So the first Question is already wrong -because i ask for myclient.test.mydomain.co.at and not for myclient.test.mydomain.co.at.test.mydomain.co.at

    Have you set local DNS server as preferred DNS Server?

    Yes - Default Server = our local DNS Server

    Thank you

    Wednesday, November 28, 2018 9:27 AM
  • Hello,

    Ok so that's why you got the issue you should always put a dot at the end of every query in nslookup in order to indicate that you don't want to append a suffix to your search.

    So if you want to search for "myclient.test.mydomain.com" you should put "myclient.test.mydomain.com."

    Below an article from an MVP regarding that :

    https://blogs.msmvps.com/acefekay/2013/02/17/nslookup-suffixing-behavior/

    Best Regards,

    Wednesday, November 28, 2018 10:13 AM
  • Hi,

    Please refer to the link below:

    https://serverfault.com/questions/285440/dns-query-appending-parent-suffix-twice  

    Best regards,

    Travis


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

    Thursday, November 29, 2018 6:27 AM
    Moderator
  • Hi,

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

    Please let us know if you would like further assistance.

    Best Regards,

    Travis


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

    Saturday, December 1, 2018 11:39 PM
    Moderator