Sometimes zone files have configuration errors


  • This website will provide more information in the near future
  • In the meantime, you may want to check our tool, CycleHunter, that we use to detect cyclic dependencies on DNS zone files.

Cyclic Dependency example

    Here we provide an example of cyclic dependency.

    We will make cat.example.nl be cyclic dependent with dog.example.net

    #zone:  dog.example.nl
    $ORIGIN .
    $TTL 1
    dog.example.nl		IN SOA	ns.cat.example.net  hostmaster.example.nl. 1 60 60 60 60
    			NS	ns.cat.example.net 
    #zone: cat.example.net 
    $ORIGIN .
    $TTL 1
    cat.example.net		IN SOA	ns.dog.example.nl hostmaster.example.net. 1 60 60 60 60
    			NS	ns.dog.example.nl


  • Mon 08 Feb 2021 10:15:12 AM UTC: example added
  • Wed 03 Feb 2021 02:05:36 PM UTC: site updated
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