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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+.. highlight: console
+
+.. BEWARE: Do not forget to edit also tsig-keygen.rst!
+
+.. iscman:: ddns-confgen
+.. program:: ddns-confgen
+.. _man_ddns-confgen:
+
+ddns-confgen - TSIG key generation tool
+---------------------------------------
+
+Synopsis
+~~~~~~~~
+:program:`ddns-confgen` [**-a** algorithm] [**-h**] [**-k** keyname] [**-q**] [**-s** name] [**-z** zone]
+
+Description
+~~~~~~~~~~~
+
+:program:`ddns-confgen` is an utility that generates keys for use in TSIG signing.
+The resulting keys can be used, for example, to secure dynamic DNS updates
+to a zone, or for the :iscman:`rndc` command channel.
+
+The key name can specified using :option:`-k` parameter and defaults to ``ddns-key``.
+The generated key is accompanied by configuration text and instructions that
+can be used with :iscman:`nsupdate` and :iscman:`named` when setting up dynamic DNS,
+including an example ``update-policy`` statement.
+(This usage is similar to the :iscman:`rndc-confgen` command for setting up
+command-channel security.)
+
+Note that :iscman:`named` itself can configure a local DDNS key for use with
+:option:`nsupdate -l`; it does this when a zone is configured with
+``update-policy local;``. :program:`ddns-confgen` is only needed when a more
+elaborate configuration is required: for instance, if :iscman:`nsupdate` is to
+be used from a remote system.
+
+Options
+~~~~~~~
+
+.. option:: -a algorithm
+
+   This option specifies the algorithm to use for the TSIG key. Available
+   choices are: hmac-md5, hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384,
+   and hmac-sha512. The default is hmac-sha256. Options are
+   case-insensitive, and the "hmac-" prefix may be omitted.
+
+.. option:: -h
+
+   This option prints a short summary of options and arguments.
+
+.. option:: -k keyname
+
+   This option specifies the key name of the DDNS authentication key. The
+   default is ``ddns-key`` when neither the :option:`-s` nor :option:`-z` option is
+   specified; otherwise, the default is ``ddns-key`` as a separate label
+   followed by the argument of the option, e.g., ``ddns-key.example.com.``
+   The key name must have the format of a valid domain name, consisting of
+   letters, digits, hyphens, and periods.
+
+.. option:: -q
+
+   This option enables quiet mode, which prints only the key, with no
+   explanatory text or usage examples. This is essentially identical to
+   :iscman:`tsig-keygen`.
+
+.. option:: -s name
+
+   This option generates a configuration example to allow dynamic updates
+   of a single hostname. The example :iscman:`named.conf` text shows how to set
+   an update policy for the specified name using the "name" nametype. The
+   default key name is ``ddns-key.name``. Note that the "self" nametype
+   cannot be used, since the name to be updated may differ from the key
+   name. This option cannot be used with the :option:`-z` option.
+
+.. option:: -z zone
+
+   This option generates a configuration example to allow
+   dynamic updates of a zone. The example :iscman:`named.conf` text shows how
+   to set an update policy for the specified zone using the "zonesub"
+   nametype, allowing updates to all subdomain names within that zone.
+   This option cannot be used with the :option:`-s` option.
+
+See Also
+~~~~~~~~
+
+:iscman:`nsupdate(1) <nsupdate>`, :iscman:`named.conf(5) <named.conf>`, :iscman:`named(8) <named>`, BIND 9 Administrator Reference Manual.