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Does this DNS server use itself to resolve DNS queries?

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  • Does this DNS server use itself to resolve DNS queries?

    We have a Windows 2008 R2 DC running DNS, but one of the admin has setup the Network Settings, Preferred DNS to point to the OTHER DNS server in the same site and Alternate DNS is set to the main DNS server in our central site.

    Based on what I can see, the server will never use itself to resolve DNS queries.

    However, when I run an IPCONFIG /ALL, I see the following:

    IPv4 Address. . . . . . . . . . . : 10.157.55.5(Preferred)
    DNS Servers . . . . . . . . . . . : ::1
    10.157.55.6
    10.155.198.6
    10.155.198.7

    Does the "::1" mean it is pointing to itself as the primary DNS server??

    I followed this up with an NSLOOKUP on the 10.157.55.5 server and got the following response:
    C:\Users\julian>nslookup
    Default Server: UnKnown
    Address: ::1

    > nslookup
    Server: UnKnown
    Address: ::1

    >
    >
    This suggests it is using itself as the preferred DNS resolver!?
    |
    +-- JDMils
    |
    +-- Regional Systems Engineer, DotNet programmer & Jack of all trades
    |

  • #2
    Re: Does this DNS server use itself to resolve DNS queries?

    ::1 is the IPv6 equivalent of 127.0.0.1

    The loopback address, 0000:0000:0000:0000:0000:0000:0000:0001, may be abbreviated to ::1 by using both rules.
    From here

    http://en.wikipedia.org/wiki/IPv6

    So to answer your question, yes it is using itself for DNS resolution.

    Comment


    • #3
      Re: Does this DNS server use itself to resolve DNS queries?

      By default the DNS server will use itself to query DNS records.
      You may notice that in the DNS settings of IPv4 Properties it has changed to 127. address (local loop back)

      Hope this helps.
      ::: Remember to give credit if you have found this useful. :::
      ::: Wild Oak Tech :::

      Comment


      • #4
        Re: Does this DNS server use itself to resolve DNS queries?

        A DNS server using itself as its primary DNS is the preferred method. The server will have a copy of the DNS zones for the domain, so there's no reason it should poll another DNS server for this information every time it attempts to resolve an internal IP address. Just make sure you have forwarders set up for external IP resolution and you're good.

        Now, bear in mind, that primary DNS address only affects that server. It does not affect any workstation/server set up to use it as its primary DNS server.
        Last edited by Bertmax; 28th August 2013, 20:04.

        Comment


        • #5
          Re: Does this DNS server use itself to resolve DNS queries?

          Thanks guys- all good now!
          |
          +-- JDMils
          |
          +-- Regional Systems Engineer, DotNet programmer & Jack of all trades
          |

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