Windows 10: Strange issue with a dodgy DNS server? Solved

  1.    15 Apr 2018 #1

    Strange issue with a dodgy DNS server?


    This is a fresh install of Windows 10.

    I used nslookup in cmd to look up an IP of a website. Here are the results:

    Code:
    C:\Users\Username>nslookup www.google.com
    Server:  UnKnown
    Address:  fe80::a08f:4f72:28c5:81c1
    
    DNS request timed out.
        timeout was 2 seconds.
    DNS request timed out.
        timeout was 2 seconds.
    DNS request timed out.
        timeout was 2 seconds.
    DNS request timed out.
        timeout was 2 seconds.
    *** Request to UnKnown timed-out
    This seemed strange to me, so I checked my DNS server settings for IPv4, and, out of the blue, it seems to have set itself to 127.7.7.6 IPv6 is also set to a manual address of "fe80::a08f:4f72:28c5:81c1"

    Why is that, and can anyone explain it? Is it something to be worried about? Websites load fine, everything works, but it doesn't seem right to me.
    Attached Thumbnails Attached Thumbnails dns.PNG  
    Last edited by TheDeerDude; 16 Apr 2018 at 06:34.
      My ComputerSystem Spec

  2.    15 Apr 2018 #2

    Set dns to 208.67.220.220 and 1.1.1.1 te setting you have is something running on your pc as its local address do you have and security or anti virus software that often does it to scan incoming requests. Do you get a reply if you put the 127.7.7.6 into a browser?
      My ComputerSystem Spec

  3.    15 Apr 2018 #3

    I tried changing them to "obtain automatically" and then to the IPs you provided, but they kept defaulting to the previous IP.

    Now that you mention it, I do - I am running Heimdal Pro with its "Traffic Scanning" features enabled. I disabled them temporarily, and I was able to change the IP configuration to what I wanted. Would it be safe to assume that it's Heimdal then, and nothing is wrong?

    I get no reply from 127.6.6.7 in the web browser
      My ComputerSystem Spec

  4.    15 Apr 2018 #4

    Heimdal Pro sounds a good idea but could give problem updating things on it own it would beinteresting to do a speed test with it off and wit hit on as the dns must be slower
      My ComputerSystem Spec


  5. Posts : 643
    Microsoft Windows 10 Pro 64-bit
       16 Apr 2018 #5

    Not sure why nslookup failed it should work since you have a set DNS server, This should work:

    Code:
    nslookup google.com 127.6.6.7
      My ComputerSystem Spec

  6.    16 Apr 2018 #6

    Samuria said: View Post
    Heimdal Pro sounds a good idea but could give problem updating things on it own it would beinteresting to do a speed test with it off and wit hit on as the dns must be slower
    I think I'll pass, I'm not even sure how I would go about that. I just wanted to make sure it wasn't something malicious changing my DNS servers. Your guess about the security software doing this was spot on, thank you

    sml156 said: View Post
    Not sure why nslookup failed it should work since you have a set DNS server, This should work:

    Code:
    nslookup google.com 127.6.6.7
    Well, that works! I don't know why but by default it's using the set IPv6 address for this, but when using that command, it works.
      My ComputerSystem Spec


  7. Posts : 34,664
    Triple boot - Win 10 Pro, Win 10 Pro Insider (2) - (and a sprinkling of VMs)
       16 Apr 2018 #7

    TheDeerDude said: View Post
    I think I'll pass, I'm not even sure how I would go about that. I just wanted to make sure it wasn't something malicious changing my DNS servers. Your guess about the security software doing this was spot on, thank you



    Well, that works! I don't know why but by default it's using the set IPv6 address for this, but when using that command, it works.
    Just FYI.... this is pretty much the most common Speed Test used, least here in TF. There are others, this is the most common. It doesn't install anything. Easy....

    https://www.speedtest.net/
      My ComputersSystem Spec

  8.    16 Apr 2018 #8

    f14tomcat said: View Post
    Just FYI.... this is pretty much the most common Speed Test used, least here in TF. There are others, this is the most common. It doesn't install anything. Easy....

    https://www.speedtest.net/
    Oh, I'm aware of the site - used it plenty of times before! Thank you though

    I just figured, DNS servers have no impact of the speed of your connection? Once your computer finds the domain's address, it shouldn't matter, should it? It's only about the time it takes to look up the domain. I didn't think this test was relevant
      My ComputerSystem Spec


  9. Posts : 34,664
    Triple boot - Win 10 Pro, Win 10 Pro Insider (2) - (and a sprinkling of VMs)
       16 Apr 2018 #9

    TheDeerDude said: View Post
    Oh, I'm aware of the site - used it plenty of times before! Thank you though

    I just figured, DNS servers have no impact of the speed of your connection? Once your computer finds the domain's address, it shouldn't matter, should it? It's only about the time it takes to look up the domain. I didn't think this test was relevant
    You're correct. Just posted that cause you mentioned "I'm not even sure how I would go about that". Guess you were referring to something else. No, far as I know, the DNS server has nothing to do with speed. Hops, jumps, and traffic congestion, re-routes...all that nasty stuff affects the speed. A speed test, like Ookla, is basically how fast can you ping the closest server, and back 'n forth. It just sends/receives little trash packets. Hardly a real world scenario. But, getting OT.....
      My ComputersSystem Spec


 

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