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How to configure a subnetted reverse lookup zone

John Curtiss 66 Reputation points
2020-12-23T20:41:18.637+00:00

i'm on server 2012 r2 DNS/AD

this document is fun.

https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-subnetted-reverse-lookup-zone

"Original product version: Windows Server 2012 R2"

but

"walkthrough for Windows 2000 and Windows Server 2003 environments"
and
"walkthrough for Windows NT 4.0 environments"

then

"Select Zone Type of Active Directory Integrated or Standard Primary"
and "If you selected standard primary...."
but not "if you selected Active Directory Integrated..."

i'm splitting the 10.160.11.0/24 subnet in half with a /25, two separate AD/DNS domains. i created an ad-integrated zone in domain1 called 0-25.11.160.10.in-addr.arpa.

before i even get to the conditional forwarding and/or delegation from domain2 part, what i'd like to happen now is to be able to nslookup 10.160.11.5 in domain1.

  1. what is the syntax for creating a ptr record for 10.160.11.5? and/or should i be able do this in the gui?
  2. what is the syntax for the nslookup? should A. "nslookup 10.160.11.5" work, or do i have to do B. "nslookup 10.160.11.25-0.5", or look up the arpa address, or am i mistaken in thinking this is the function of the reverse zone, since neither A nor B are working for me after creating a normal PTR in the gui?
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  1. Gloria Gu 3,921 Reputation points
    2020-12-25T05:30:44.21+00:00

    @JohnpCurtiss Hi,

    Thank you for posting in Q&A!

    In my understanding, you have two zones hosted in two seperate domain, on is 10.160.11.1~10.160.11.126(domain 2), another is 10.160.11.127~10.160.11.254(domain 1).
    You've create a subnetted reverse lookup zone of domain 1. (which don't include 10.160.11.5)
    Then you want to mannually add a PTR record in the zone you created so that you can "nslookup 10.160.11.5". (not with the configuration of conditional forwarder or delegation)
    If my understanding has any problem, please help me to correct it.

    Based on my research and test, unfortunately it seems cannot be achieved.

    The records of domain1 will automatically update its PTR record. But if you want to mannually add a PRT record of domain2, it seems cannot be achieved by GUI or Powershell command. You can only nslookup records of domain2 when you configure conditional forwarder or delegation.

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    Merry Christmas, Hope you have a nice day : )
    Gloria

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  2. John Curtiss 66 Reputation points
    2020-12-25T06:04:05.407+00:00

    @Gloria Gu

    you have domain1 and 2 reversed, but let's forget about domain2 for now. for now, this is the issue:

    ---i created a subnetted reverse zone for 10.160.11.0/25 on domain1's dns server, and i want to be able to query domain1's dns server for records in this reverse zone.

    per this document: https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-subnetted-reverse-lookup-zone

    you said: "You've create a subnetted reverse lookup zone of domain 1. (which don't include 10.160.11.5)"

    as far as i know, my subnetted reverse lookup zone 0-25.11.160.10.in-addr.arpa does include 10.160.11.5. per the document linked above, the syntax "0-25.11.160.10.in-addr.arpa" means "10.160.11.0/25" which includes 10.160.11.1-10.160.11.126, which includes 10.160.11.5.

    -what is the syntax to create a ptr record for 10.160.11.5 in the 0-25.11.160.10.in-addr.arpa subnetted reverse zone?
    -what is the syntax to nslookup domain1's dns server for the ptr record for 10.160.11.5 in the 0-25.11.160.10.in-addr.arpa subnetted reverse zone

  3. John Curtiss 66 Reputation points
    2020-12-28T12:16:20.833+00:00

    According to any Google search, and/or the Microsoft document I've already linked multiple times in this thread, there is no automatic/dynamic registration of ptr records in subnetted reverse zones. Ptr records must be manually created in subnetted reverse zones. If you have other documentation that contradicts this, please provide a link to it.

    So,

    -what is the syntax to create a ptr record for 10.160.11.5 in the 0-25.11.160.10.in-addr.arpa subnetted reverse zone?
    -what is the syntax to nslookup domain1's dns server for the ptr record for 10.160.11.5 in the 0-25.11.160.10.in-addr.arpa subnetted reverse zone?

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