NAME

       ddns-confgen - ddns key generation tool

SYNOPSIS

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

DESCRIPTION

       ddns-confgen generates a key for use by nsupdate and named. It simplifies configuration of
       dynamic zones by generating a key and providing the nsupdate and named.conf syntax that
       will be needed to use it, including an example update-policy statement.

       If a domain name is specified on the command line, it will be used in the name of the
       generated key and in the sample named.conf syntax. For example, ddns-confgen example.com
       would generate a key called "ddns-key.example.com", and sample named.conf command that
       could be used in the zone definition for "example.com".

       Note that named itself can configure a local DDNS key for use with nsupdate -l.
       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
           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.

       -h
           Prints a short summary of the options and arguments to ddns-confgen.

       -k keyname
           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
           Quiet mode: Print only the key, with no explanatory text or usage examples.

       -r randomfile
           Specifies a source of random data for generating the authorization. If the operating
           system does not provide a /dev/random or equivalent device, the default source of
           randomness is keyboard input.  randomdev specifies the name of a character device or
           file containing random data to be used instead of the default. The special value
           keyboard indicates that keyboard input should be used.

       -s name
           Single host mode: 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
           zone mode: 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

       Copyright © 2009 Internet Systems Consortium, Inc. ("ISC")