Share Facebook Email Twitter Reddit. As part of this commitment, they sponsor the development of software that would benefit the Internet and make that software available as open source. An explanation of how fields are used and concatenated together is detailed below. See the sort man page for the appropriate parameters, and then modify the call to sort within this Bash script. If you prefer to think in percentages, just make sure all your “repeat counts” of the “hosts” parameter add up to , and that your “zones” parameter is a multiple of You don’t have to use both tokens if your database query doesn’t require it. On the third, “grandchildren3.

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We are also telling dl CSV file writer which file to write to. Sometimes your particular DNS server may have a lot of small zones, or a few very large ones.

This parameter is optional and always located at argv[6]. The chart below shows the order in which fields should be returned in queries. Braces can be used inside of DLZ command lines to group several items together into one parameter. The only limitations are: If only one query is supplied, zone transfers will fail!

The only parameter it requires is the name and location of the output file.

Using DLZ in BIND

In the future a third may be developed to provide even better performance. This lets allowzonexfr determine if the zone is supported by the database, before it attempts to determine if a zone transfer is allowed on the zone by the client. The first parameter “allnodes” is used internally by ldz driver and BIND so you can just ignore it.


This bund it easy for one query to return a number of different DNS types.

This query is used rlz lookup in the Postgres driver. Also notice the double quote and semi-colon at the end of the line.

Sometimes, though, we want to return data that is NOT relative to the zone.

This string must be formatted as BIND expects it. Ideally, this driver will be included into BIND’s distribution as a built in driver. Thus, when someone attempts to perform a zone transfer, this query is run if the zone exists, whether or not the requestor bund allowed to perform the zone transfer.

This program reads from standard in and writes to standard out and does not take any command line parameters. This parameter is optional and always located at argv[6].

Consequently, DLZ is not recommended for use on high-volume servers. It is very easy to make a dls when editing a file causing it to be mis-read or dzl un-readable by BIND. I considered this approach and decided against it. Like the findzone query, the results returned by the allowzonexfr query are not really used, so what you return and in what order doesn’t really matter.

Knowledge Articles-Using DLZ in BIND

In this sample query, we are artificially preventing NS and SOA records from being returned by the query so that we can show the use of the authority function later in this document. The query should return all records matching the record and zone parameters.


To test a loaded DNS server properly, you will need three machines. Not all zones have the same number of hosts in them. This lets allowzonexfr determine if the zone is supported by the database, before it attempts to determine if a zone transfer is allowed on the zone by the client.

Using timeDnsRefresh, you can determine how long it takes a DNS server to respond with updated data, or how long it takes a server to start.

This can be a bit difficult to understand, so be sure to read the next section of the documentation thoroughly and carefully! The double quote closes the command line string that was started on the second line. Writers are grouped into packages.

NLnet; BIND DLZ; Phase 2 Project Plan

This enterprise grade database can now be used directly to store, manipulate, and manage your DNS data. This query is used by allowzonexfr in the MySQL driver. This further randomizes the data, as the same names are not always used for only host names or zone names.

Query latency is how long a DNS server takes to respond to your query.