NAME

       ddns-confgen - ddns key generation tool

SYNOPSIS

       ddns-confgen [-a algorithm] [-h] [-k keyname] [-q] [-s name] [-z zone]

DESCRIPTION

       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 rndc command channel.

       The key name can specified using -k parameter and defaults to ddns-key.  The generated key is accompanied
       by  configuration  text and instructions that can be used with nsupdate and named when setting up dynamic
       DNS, including an example update-policy statement.  (This usage is similar to  the  rndc-confgen  command
       for setting up command-channel security.)

       Note  that named itself can configure a local DDNS key for use with nsupdate -l; it does this when a zone
       is configured with update-policy local;. ddns-confgen is only needed when a more elaborate  configuration
       is required: for instance, if nsupdate is to be used from a remote system.

OPTIONS

       -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.

       -h     This option prints a short summary of options and arguments.

       -k keyname
              This  option  specifies  the key name of the DDNS authentication key. The default is ddns-key when
              neither the -s nor -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.

       -q     This option enables quiet mode, which prints only the key,  with  no  explanatory  text  or  usage
              examples. This is essentially identical to tsig-keygen.

       -s name
              This  option  generates a configuration example to allow dynamic updates of a single hostname. The
              example 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  -z
              option.

       -z zone
              This  option  generates  a  configuration  example to allow dynamic updates of a zone. The example
              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 -s option.

SEE ALSO

       nsupdate(1), named.conf(5), named(8), BIND 9 Administrator Reference Manual.

AUTHOR

       Internet Systems Consortium

COPYRIGHT

       2025, Internet Systems Consortium