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       inadyn - a client for open DNS servers.


       inadyn  [-h  |  --help]  [-u  | --username username ] [-p | -- password
       password  ]  [-a  |  --alias[,hash]  alias,hash  [-a  |  --alias[,hash]
       another_alias,the_other_hash    ...   ]]   [--input_file   path/name  ]
       [--ip_server_name  server[:port]  url  ]   [--dyndns_server_name[:port]
       server[:port]   ]  [--dyndns_system  service  ]  [--proxy_server[:port]
       proxy[:port]  ]  [--update_period  ms  ]  [--update_period_sec  sec   ]
       [--forced_update_period  sec  ]  [--log_file path/name ] [--background]
       [--verbose  level   ]   [--iterations   iterations   ]   [--syslog]   ]
       [--change_persona uid[:gid] ]


       inadyn  is  a  client for ‘open’ name servers. That is, it let the user
       have an Internet recognized name for his machine by transferring to him
       some  control  over  a name server that he does not manage. Some of the
       services that are offered by  those  open  name  servers  are  free  of
       charge,  and  work  even when the client machine does not have a static
       IP.   The   name   servers   that   are   supported   by   inayn   are: and

       Its  basic  operation is to periodically check whether the actual IP of
       the client machine is the same one that is recorded in the name server,
       and update the name server records when there is a mismatch.

       -h, --help
              Print a summary of the options to inadyn and exit.

       -u, --username
              The  username, if applicable. This might be referred to as hash.

       -p, --password
              The password, if applicable.

       -a, --alias[,hash]
              A host name alias. This option can appear  multiple  times,  for
              each domain that has the same IP.

              The  file  name  that contains inadyn command options exactly as
              specified in the command line  syntax  (adds  to  those  already
              present in the cmd line). The default configuration file name is
              ’/etc/inadyn.conf’. It is looked at automatically if  inadyn  is
              called  without  any  command  line  options.  The  format is as
              expected for a **NIX config   the  hash  character  is  used  to
              comment  entire  lines. Spaces are ingored. The long options may
              be specified without -- if placed at the beginning of the  line.

       --ip_server_name[:port] url
              The   client   IP   is  detected  by  calling  ’url’  from  this
              ’ip_server_name:port’.  Defaults to /.

              The server that receives the update DNS requests. When no  proxy
              is  specified  it is sufficient to set the dyndns_system so that
              the default servers will be taken.  The  option  is  useful  for
              generic DynDNS services that support HTTP update.

       --dyndns_server_url name
              The update path inside the DynDNS server.

              An   optional   DNS   service.   For  the
              acceptable    services    are    one    of,
      or  There  is  only  one
              acceptable service  for  ,  which  is
           Other       services      are:
    ,  custom@http_svr_basic_auth.  The  default
              service  is,  which is believed to be used by
              most users, at least initially.

              An http proxy server name and port. The default is none.

              How often the IP is  checked.  This  value  denotes  millisecond
              (There  are  1000  milliseconds  in  one second). The default is
              about 1 minute. The maximum is 10 days.

              How often the IP is checked. Here the value denotes seconds. The
              default is about 1 minute. The maximum value is 10 days.

              How  often  the  IP should be updated even if it is not changed.
              The time should be given in seconds.

              The name, including the full path, of a log file.

              run in background. Output is sent to the UNIX syslog  facilities
              or to a log file, if one was specified.

              Set the debug level, which is an integer between 0 to 5.

              Set  the  number  of  DNS updates. The default is 0, which means

              Explicitly sending the output to a syslog  like  file,  such  as

       --change_persona uid[:gid]
              After  init  changes  user ID and group ID to the provided ones.
              This allows dropping unneeded [root] privileges after startup.

       inadyn  -u username -p password -a

       inadyn --username test --password test  --update_period  60000  --alias
     --alias my.second.domain

       inadyn --background  -u  test  -p  test  --update_period  60000 --alias
        --alias    my.second.domain     --log_file
       inadyn --dyndns_service          -a

       inadyn --update_period 60000 --alias,hash_for_host1  -a
              my.second.domain,hash2                           --dyndns_system

       The ’hash’ should be extracted from the grab url batch file that can be
       downloaded  from  the  site. A single hashed (base64 encoded) string is
       preferred upon a username and password pair, apparently to  reduce  the
       computational  resources  that is required on their side. Unfortunately
       the hash can not be computed by inadyn because it requires the index to
       the  username  record  in the freedns database, which is not known. The
       simplest solution seems to be a copy&paste action  from  the  grab  url
       batch file offered on their website. When the batch file looks is like


       the  hash  string, which is what the user should copy and paste, is the
       string that begins right after the ’?’ character and ends with the  end
       of  line.  This string shell be used as the username in inadyn command.
       When the user has several names then each name should be followed  with
       that name hash string.


       inadyn  prints a message when the IP is updated. If no update is needed
       then by default it prints a single ’.’ character, unless  --verbose  is
       set  to  0.  Therefore, unless --verbose is set to 0, the log file will
       contains lot of dots. When the connection goes down it  could  be  that
       inadyn will print some error messages. Those are harmless and should be
       followed by ’OK’ messages after the connection is back up.


       Any of the SIG_HUP, SIG_INT, SIG_QUIT will cause  inadyn  to  terminate


   Other manual pages
       The   syntax   of   the   optional   configuration  file  is  given  by

   Internet resources
       Inadyn ´s home page is


       inadyn was written by Narcis Ilisei, <>.

       This manual page was written by Shaul Karl, <>, for the
       Debian GNU/Linux system, based on the readme.html file that is found in
       the source.