is dns not working mean router failure or my wi fi card a problem.


  1. Posts : 1
    windows 10
       #1

    is dns not working mean router failure or my wi fi card a problem.


    Sir
    I face this problem of dns not available once or twice every month. Is it driver fault on my dell laptops wi-fi card or router needs to be replaced.
    My service provider in india is not responding.
    I will reload the driver for wi fi card (Realtek) and reset the router (Netgear 614) and it will work again.
    all instruction searched through google did not help.


    Thanks
    Ravindran
      My Computer


  2. Posts : 4,161
    Windows 11 Pro, 22H2
       #2

    Welcome to TenForums!

    There are a number of possible reasons for DNS not working, but start with the basics:

    Run the command nslookup. This will attempt to query your DNS server and allow you to lookup addresses to see if you are getting a response. The output should look a little like this:

    C:\>nslookup
    Default Server: UnKnown
    Address: 192.168.4.1

    >

    Note that in the above it is showing me that my DNS server is 192.168.4.1. This is an internal address on my network because my own router is my DNS server which then forwards requests to a DNS server on the Internet.

    Now, type in the name of some Internet address to see if DNS is working. In the example below, I am looking for "www.google.com":

    C:\>nslookup
    Default Server: UnKnown
    Address: 192.168.4.1

    > Google
    Server: UnKnown
    Address: 192.168.4.1

    Non-authoritative answer:
    Name: Google
    Addresses: 2607:f8b0:4000:805::2004
    142.250.138.103
    142.250.138.104
    142.250.138.105
    142.250.138.99
    142.250.138.147
    142.250.138.106

    >

    Note that I successfully got back a number of IP addresses associated with Google. Now, I am going to use the "server" command to change to another DNS server. In this case, I'm going to put in a fake address of 192.168.4.5 just to show what happens when the DNS server cannot be reached:

    > server 192.168.4.5
    Default Server: [192.168.4.5]
    Address: 192.168.4.5

    > Google
    Server: [192.168.4.5]
    Address: 192.168.4.5

    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 [192.168.4.5] timed-out
    >

    Next, try pointing to another DNS server. In the example below, I am going to point to a google DNS server that has an address of 8.8.8.8 (yes, that is a real DNS server address):

    > server 8.8.8.8
    Default Server: dns.google
    Address: 8.8.8.8

    > Google
    Server: dns.google
    Address: 8.8.8.8

    Non-authoritative answer:
    Name: Google
    Addresses: 2607:f8b0:4000:800::2004
    142.251.40.68

    >

    To exit out of NSLOOKUP, simply run the command EXIT.

    To summarize, try using NSLOOKUP to query your DNS server. If that fails, try pointing to other known DNS servers and then querying again. If that works, then there may be a problem with the DNS server you are using or it could simply be a problem reaching that DNS server. If it still fails when you point to other DNS servers, then it may be more of a general connectivity issue rather than a DNS issue.

    Let me know if that does not get you any answers as there are other things that we can do as well. This is just a good starting point.
      My Computers


  3. Posts : 8,128
    windows 10
       #3

    If your router is the DNS it's very slow as it has to ask another server set DNS to 1.1.1.1 & 8.8.8.8
      My Computer


 

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